Cook Partisan Voting Index

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The Cook Partisan Voting Index (CPVI), sometimes referred to as simply the Partisan Voting Index (PVI), is a measurement of how strongly an American congressional district leans toward one political party compared to the nation as a whole. It was developed in 1997 by Charlie Cook of the Cook Political Report, a nonpartisan political newsletter, working with Polidata, a political statistics analysis firm.

The index for each congressional district is derived by averaging its results from the prior two presidential elections and comparing them to national results. The index indicates which party's candidate was more successful in that district, as well as the number of percentage points by which its results exceeded the national average. The index is formatted as a letter + number; in a district whose CPVI score is R+2, recent Republican presidential candidates received 2 percentage points more votes than the national average. Likewise, a CPVI score of D+3 shows the Democrats received 3 percentage points more votes than the national average.

Contents

[edit] List of PVIs

[edit] Extremes

The most Democratic congressional districts in the country are New York's 15th and 16th at D+43, while the most Republican district is Utah's 3rd with a PVI of R+26. As for states as a whole, Utah is the most Republican at R+22, and Massachusetts, New York and Rhode Island are the most Democratic at D+15 (and D+39 for the District of Columbia). If all states voted exactly on partisan lines according to this index in a presidential election (including Ohio at R+0 for the GOP), the Democrats would win the election 296-242 electoral votes.

The most Republican congressional district to be represented by a Democrat is Idaho's 1st congressional district, which has a CPVI of R+19. It is represented by Walt Minnick, who won election in 2008. The most Democratic congressional district to be represented by a Republican is Louisiana's 2nd congressional district, which has a PVI of D+28. It is represented by Joseph Cao, who also won election in 2008.

There are currently 15 Democratic leaning districts represented by Republicans and 51 Republican leaning districts represented by Democrats. Therefore 66 of 435 districts are represented by a member of the opposite party than the way which the district leans politically. This is a cross-over rate of about 15%.

[edit] By congressional district

According to the Cook Political Report for the 110th U.S. Congress, calculated according to the results of the 2000 and the 2004 U.S. presidential elections. The party representations are based on the winners of the 2008 U.S. House elections.

State District PVI PVI
in Congress
Alabama 1st 087R+12 Republican
Alabama 2nd 086R+13 Democratic
Alabama 3rd 095R+4 Republican
Alabama 4th 083R+16 Republican
Alabama 5th 093R+6 Democratic
Alabama 6th 074R+25 Republican
Alabama 7th 117D+17 Democratic
Alaska At-large 085R+14 Republican
Arizona 1st 097R+2 Democratic
Arizona 2nd 090R+9 Republican
Arizona 3rd 093R+6 Republican
Arizona 4th 114D+14 Democratic
Arizona 5th 095R+4 Democratic
Arizona 6th 087R+12 Republican
Arizona 7th 110D+10 Democratic
Arizona 8th 098R+1 Democratic
Arkansas 1st 101D+1 Democratic
Arkansas 2nd 099R+0 Democratic
Arkansas 3rd 088R+11 Republican
Arkansas 4th 100D+0 Democratic
California 1st 110D+10 Democratic
California 2nd 086R+13 Republican
California 3rd 092R+7 Republican
California 4th 088R+11 Republican
California 5th 114D+14 Democratic
California 6th 121D+21 Democratic
California 7th 119D+19 Democratic
California 8th 136D+36 Democratic
California 9th 138D+38 Democratic
California 10th 109D+9 Democratic
California 11th 096R+3 Democratic
California 12th 122D+22 Democratic
California 13th 122D+22 Democratic
California 14th 118D+18 Democratic
California 15th 114D+14 Democratic
California 16th 116D+16 Democratic
California 17th 117D+17 Democratic
California 18th 103D+3 Democratic
California 19th 089R+10 Republican
California 20th 105D+5 Democratic
California 21st 086R+13 Republican
California 22nd 083R+16 Republican
California 23rd 109D+9 Democratic
California 24th 094R+5 Republican
California 25th 092R+7 Republican
California 26th 095R+4 Republican
California 27th 113D+13 Democratic
California 28th 125D+25 Democratic
California 29th 112D+12 Democratic
California 30th 120D+20 Democratic
California 31st 130D+30 Democratic
California 32nd 117D+17 Democratic
California 33rd 136D+36 Democratic
California 34th 123D+23 Democratic
California 35th 133D+33 Democratic
California 36th 111D+11 Democratic
California 37th 127D+27 Democratic
California 38th 120D+20 Democratic
California 39th 113D+13 Democratic
California 40th 091R+8 Republican
California 41st 090R+9 Republican
California 42nd 089R+10 Republican
California 43rd 113D+13 Democratic
California 44th 093R+6 Republican
California 45th 096R+3 Republican
California 46th 093R+6 Republican
California 47th 105D+5 Democratic
California 48th 091R+8 Republican
California 49th 089R+10 Republican
California 50th 094R+5 Republican
California 51st 107D+7 Democratic
California 52nd 090R+9 Republican
California 53rd 112D+12 Democratic
Colorado 1st 118D+18 Democratic
Colorado 2nd 108D+8 Democratic
Colorado 3rd 093R+6 Democratic
Colorado 4th 090R+9 Democratic
Colorado 5th 083R+16 Republican
Colorado 6th 089R+10 Republican
Colorado 7th 102D+2 Democratic
Connecticut 1st 114D+14 Democratic
Connecticut 2nd 108D+8 Democratic
Connecticut 3rd 112D+12 Democratic
Connecticut 4th 105D+5 Democratic
Connecticut 5th 104D+4 Democratic
Delaware At-large 107D+7 Republican
District of Columbia At-large 139D+39 Democratic
Florida 1st 080R+19 Republican
Florida 2nd 097R+2 Democratic
Florida 3rd 114D+14 Democratic
Florida 4th 085R+14 Republican
Florida 5th 094R+5 Republican
Florida 6th 091R+8 Republican
Florida 7th 095R+4 Republican
Florida 8th 096R+3 Democratic
Florida 9th 095R+4 Republican
Florida 10th 101D+1 Republican
Florida 11th 111D+11 Democratic
Florida 12th 094R+5 Republican
Florida 13th 095R+4 Republican
Florida 14th 089R+10 Republican
Florida 15th 095R+4 Republican
Florida 16th 097R+2 Republican
Florida 17th 135D+35 Democratic
Florida 18th 095R+4 Republican
Florida 19th 121D+21 Democratic
Florida 20th 118D+18 Democratic
Florida 21st 093R+6 Republican
Florida 22nd 104D+4 Democratic
Florida 23rd 129D+29 Democratic
Florida 24th 096R+3 Democratic
Florida 25th 095R+4 Republican
Georgia 1st 086R+13 Republican
Georgia 2nd 102D+2 Democratic
Georgia 3rd 081R+18 Republican
Georgia 4th 122D+22 Democratic
Georgia 5th 125D+25 Democratic
Georgia 6th 081R+18 Republican
Georgia 7th 081R+18 Republican
Georgia 8th 091R+8 Democratic
Georgia 9th 076R+23 Republican
Georgia 10th 086R+13 Republican
Georgia 11th 082R+17 Republican
Georgia 12th 105D+5 Democratic
Georgia 13th 110D+10 Democratic
Hawaii 1st 107D+7 Democratic
Hawaii 2nd 110D+10 Democratic
Idaho 1st 080R+19 Democratic
Idaho 2nd 080R+19 Republican
Illinois 1st 135D+35 Democratic
Illinois 2nd 135D+35 Democratic
Illinois 3rd 110D+10 Democratic
Illinois 4th 131D+31 Democratic
Illinois 5th 118D+18 Democratic
Illinois 6th 096R+3 Republican
Illinois 7th 135D+35 Democratic
Illinois 8th 094R+5 Democratic
Illinois 9th 120D+20 Democratic
Illinois 10th 104D+4 Republican
Illinois 11th 098R+1 Democratic
Illinois 12th 105D+5 Democratic
Illinois 13th 094R+5 Republican
Illinois 14th 094R+5 Democratic
Illinois 15th 093R+6 Republican
Illinois 16th 095R+4 Republican
Illinois 17th 105D+5 Democratic
Illinois 18th 094R+5 Republican
Illinois 19th 091R+8 Republican
Indiana 1st 108D+8 Democratic
Indiana 2nd 095R+4 Democratic
Indiana 3rd 083R+16 Republican
Indiana 4th 082R+17 Republican
Indiana 5th 079R+20 Republican
Indiana 6th 088R+11 Republican
Indiana 7th 109D+9 Democratic
Indiana 8th 090R+9 Democratic
Indiana 9th 092R+7 Democratic
Iowa 1st 105D+5 Democratic
Iowa 2nd 107D+7 Democratic
Iowa 3rd 101D+1 Democratic
Iowa 4th 100D+0 Republican
Iowa 5th 091R+8 Republican
Kansas 1st 079R+20 Republican
Kansas 2nd 092R+7 Republican
Kansas 3rd 095R+4 Democratic
Kansas 4th 087R+12 Republican
Kentucky 1st 089R+10 Republican
Kentucky 2nd 086R+13 Republican
Kentucky 3rd 102D+2 Democratic
Kentucky 4th 087R+12 Republican
Kentucky 5th 091R+8 Republican
Kentucky 6th 092R+7 Democratic
Louisiana 1st 081R+18 Republican
Louisiana 2nd 128D+28 Republican
Louisiana 3rd 094R+5 Democratic
Louisiana 4th 092R+7 Republican
Louisiana 5th 089R+10 Republican
Louisiana 6th 092R+7 Republican
Louisiana 7th 092R+7 Republican
Maine 1st 106D+6 Democratic
Maine 2nd 103D+3 Democratic
Maryland 1st 089R+10 Democratic
Maryland 2nd 108D+8 Democratic
Maryland 3rd 107D+7 Democratic
Maryland 4th 130D+30 Democratic
Maryland 5th 109D+9 Democratic
Maryland 6th 086R+13 Republican
Maryland 7th 125D+25 Democratic
Maryland 8th 120D+20 Democratic
Massachusetts 1st 115D+15 Democratic
Massachusetts 2nd 113D+13 Democratic
Massachusetts 3rd 113D+13 Democratic
Massachusetts 4th 119D+19 Democratic
Massachusetts 5th 111D+11 Democratic
Massachusetts 6th 111D+11 Democratic
Massachusetts 7th 119D+19 Democratic
Massachusetts 8th 133D+33 Democratic
Massachusetts 9th 115D+15 Democratic
Massachusetts 10th 109D+9 Democratic
Michigan 1st 097R+2 Democratic
Michigan 2nd 090R+9 Republican
Michigan 3rd 090R+9 Republican
Michigan 4th 095R+4 Republican
Michigan 5th 112D+12 Democratic
Michigan 6th 097R+2 Republican
Michigan 7th 097R+2 Democratic
Michigan 8th 097R+2 Republican
Michigan 9th 099R+0 Democratic
Michigan 10th 095R+4 Republican
Michigan 11th 098R+1 Republican
Michigan 12th 113D+13 Democratic
Michigan 13th 132D+32 Democratic
Michigan 14th 133D+33 Democratic
Michigan 15th 113D+13 Democratic
Minnesota 1st 098R+1 Democratic
Minnesota 2nd 096R+3 Republican
Minnesota 3rd 098R+1 Republican
Minnesota 4th 113D+13 Democratic
Minnesota 5th 121D+21 Democratic
Minnesota 6th 094R+5 Republican
Minnesota 7th 093R+6 Democratic
Minnesota 8th 104D+4 Democratic
Mississippi 1st 089R+10 Democratic
Mississippi 2nd 110D+10 Democratic
Mississippi 3rd 085R+14 Republican
Mississippi 4th 083R+16 Democratic
Missouri 1st 126D+26 Democratic
Missouri 2nd 090R+9 Republican
Missouri 3rd 108D+8 Democratic
Missouri 4th 088R+11 Democratic
Missouri 5th 112D+12 Democratic
Missouri 6th 094R+5 Republican
Missouri 7th 085R+14 Republican
Missouri 8th 088R+11 Republican
Missouri 9th 092R+7 Republican
Montana At-large 088R+11 Republican
Nebraska 1st 087R+12 Republican
Nebraska 2nd 090R+9 Republican
Nebraska 3rd 075R+24 Republican
Nevada 1st 109D+9 Democratic
Nevada 2nd 091R+8 Republican
Nevada 3rd 101D+1 Democratic
New Hampshire 1st 099R+0 Democratic
New Hampshire 2nd 103D+3 Democratic
New Jersey 1st 114D+14 Democratic
New Jersey 2nd 104D+4 Republican
New Jersey 3rd 103D+3 Democratic
New Jersey 4th 098R+1 Republican
New Jersey 5th 095R+4 Republican
New Jersey 6th 112D+12 Democratic
New Jersey 7th 098R+1 Republican
New Jersey 8th 112D+12 Democratic
New Jersey 9th 113D+13 Democratic
New Jersey 10th 134D+34 Democratic
New Jersey 11th 093R+6 Republican
New Jersey 12th 108D+8 Democratic
New Jersey 13th 123D+23 Democratic
New Mexico 1st 102D+2 Democratic
New Mexico 2nd 093R+6 Democratic
New Mexico 3rd 106D+6 Democratic
New York 1st 103D+3 Democratic
New York 2nd 108D+8 Democratic
New York 3rd 102D+2 Republican
New York 4th 109D+9 Democratic
New York 5th 118D+18 Democratic
New York 6th 138D+38 Democratic
New York 7th 128D+28 Democratic
New York 8th 128D+28 Democratic
New York 9th 114D+14 Democratic
New York 10th 141D+41 Democratic
New York 11th 140D+40 Democratic
New York 12th 134D+34 Democratic
New York 13th 101D+1 Democratic
New York 14th 126D+26 Democratic
New York 15th 143D+43 Democratic
New York 16th 143D+43 Democratic
New York 17th 121D+21 Democratic
New York 18th 110D+10 Democratic
New York 19th 098R+1 Democratic
New York 20th 096R+3 Vacant
New York 21st 109D+9 Democratic
New York 22nd 106D+6 Democratic
New York 23rd 099R+0 Republican
New York 24th 098R+1 Democratic
New York 25th 103D+3 Democratic
New York 26th 096R+3 Republican
New York 27th 107D+7 Democratic
New York 28th 115D+15 Democratic
New York 29th 094R+5 Democratic
North Carolina 1st 109D+9 Democratic
North Carolina 2nd 096R+3 Democratic
North Carolina 3rd 084R+15 Republican
North Carolina 4th 106D+6 Democratic
North Carolina 5th 084R+15 Republican
North Carolina 6th 082R+17 Republican
North Carolina 7th 096R+3 Democratic
North Carolina 8th 096R+3 Democratic
North Carolina 9th 087R+12 Republican
North Carolina 10th 084R+15 Republican
North Carolina 11th 092R+7 Democratic
North Carolina 12th 111D+11 Democratic
North Carolina 13th 102D+2 Democratic
North Dakota At-large 086R+13 Democratic
Ohio 1st 098R+1 Democratic
Ohio 2nd 086R+13 Republican
Ohio 3rd 096R+3 Republican
Ohio 4th 085R+14 Republican
Ohio 5th 089R+10 Republican
Ohio 6th 100D+0 Democratic
Ohio 7th 093R+6 Republican
Ohio 8th 087R+12 Republican
Ohio 9th 109D+9 Democratic
Ohio 10th 108D+8 Democratic
Ohio 11th 133D+33 Democratic
Ohio 12th 098R+1 Republican
Ohio 13th 106D+6 Democratic
Ohio 14th 097R+2 Republican
Ohio 15th 098R+1 Democratic
Ohio 16th 095R+4 Democratic
Ohio 17th 114D+14 Democratic
Ohio 18th 093R+6 Democratic
Oklahoma 1st 086R+13 Republican
Oklahoma 2nd 094R+5 Democratic
Oklahoma 3rd 081R+18 Republican
Oklahoma 4th 086R+13 Republican
Oklahoma 5th 087R+12 Republican
Oregon 1st 106D+6 Democratic
Oregon 2nd 088R+11 Republican
Oregon 3rd 118D+18 Democratic
Oregon 4th 100D+0 Democratic
Oregon 5th 101D+1 Democratic
Pennsylvania 1st 136D+36 Democratic
Pennsylvania 2nd 139D+39 Democratic
Pennsylvania 3rd 097R+2 Democratic
Pennsylvania 4th 096R+3 Democratic
Pennsylvania 5th 089R+10 Republican
Pennsylvania 6th 102D+2 Republican
Pennsylvania 7th 104D+4 Democratic
Pennsylvania 8th 103D+3 Democratic
Pennsylvania 9th 084R+15 Republican
Pennsylvania 10th 091R+8 Democratic
Pennsylvania 11th 105D+5 Democratic
Pennsylvania 12th 105D+5 Democratic
Pennsylvania 13th 108D+8 Democratic
Pennsylvania 14th 122D+22 Democratic
Pennsylvania 15th 102D+2 Republican
Pennsylvania 16th 088R+11 Republican
Pennsylvania 17th 092R+7 Democratic
Pennsylvania 18th 097R+2 Republican
Pennsylvania 19th 087R+12 Republican
Rhode Island 1st 116D+16 Democratic
Rhode Island 2nd 113D+13 Democratic
South Carolina 1st 089R+10 Republican
South Carolina 2nd 090R+9 Republican
South Carolina 3rd 085R+14 Republican
South Carolina 4th 084R+15 Republican
South Carolina 5th 093R+6 Democratic
South Carolina 6th 111D+11 Democratic
South Dakota At-large 089R+10 Democratic
Tennessee 1st 085R+14 Republican
Tennessee 2nd 088R+11 Republican
Tennessee 3rd 091R+8 Republican
Tennessee 4th 096R+3 Democratic
Tennessee 5th 106D+6 Democratic
Tennessee 6th 095R+4 Democratic
Tennessee 7th 089R+10 Republican
Tennessee 8th 100D+0 Democratic
Tennessee 9th 116D+16 Democratic
Texas 1st 082R+17 Republican
Texas 2nd 087R+12 Republican
Texas 3rd 082R+17 Republican
Texas 4th 082R+17 Republican
Texas 5th 083R+16 Republican
Texas 6th 084R+15 Republican
Texas 7th 083R+16 Republican
Texas 8th 079R+20 Republican
Texas 9th 121D+21 Democratic
Texas 10th 086R+13 Republican
Texas 11th 074R+25 Republican
Texas 12th 085R+14 Republican
Texas 13th 074R+25 Republican
Texas 14th 085R+14 Republican
Texas 15th 103D+3 Democratic
Texas 16th 109D+9 Democratic
Texas 17th 081R+18 Democratic
Texas 18th 123D+23 Democratic
Texas 19th 074R+25 Republican
Texas 20th 108D+8 Democratic
Texas 21st 083R+16 Republican
Texas 22nd 084R+15 Republican
Texas 23rd 095R+4 Democratic
Texas 24th 084R+15 Republican
Texas 25th 101D+1 Democratic
Texas 26th 087R+12 Republican
Texas 27th 098R+1 Democratic
Texas 28th 098R+1 Democratic
Texas 29th 108D+8 Democratic
Texas 30th 126D+26 Democratic
Texas 31st 083R+16 Republican
Texas 32nd 088R+11 Republican
Utah 1st 077R+22 Republican
Utah 2nd 082R+17 Democratic
Utah 3rd 073R+26 Republican
Vermont At-large 109D+9 Democratic
Virginia 1st 090R+9 Republican
Virginia 2nd 093R+6 Democratic
Virginia 3rd 118D+18 Democratic
Virginia 4th 094R+5 Republican
Virginia 5th 093R+6 Democratic
Virginia 6th 088R+11 Republican
Virginia 7th 088R+11 Republican
Virginia 8th 114D+14 Democratic
Virginia 9th 092R+7 Democratic
Virginia 10th 094R+5 Republican
Virginia 11th 098R+1 Democratic
Washington 1st 107D+7 Democratic
Washington 2nd 103D+3 Democratic
Washington 3rd 100D+0 Democratic
Washington 4th 086R+13 Republican
Washington 5th 092R+7 Republican
Washington 6th 106D+6 Democratic
Washington 7th 130D+30 Democratic
Washington 8th 102D+2 Republican
Washington 9th 106D+6 Democratic
West Virginia 1st 093R+6 Democratic
West Virginia 2nd 094R+5 Republican
West Virginia 3rd 100D+0 Democratic
Wisconsin 1st 097R+2 Republican
Wisconsin 2nd 113D+13 Democratic
Wisconsin 3rd 103D+3 Democratic
Wisconsin 4th 120D+20 Democratic
Wisconsin 5th 087R+12 Republican
Wisconsin 6th 094R+5 Republican
Wisconsin 7th 102D+2 Democratic
Wisconsin 8th 095R+4 Democratic
Wyoming At-large 080R+19 Republican

[edit] By state

Based on the 2000 U.S. presidential election and the 2004 U.S. presidential election. The party representations are based on the winners of the 2008 U.S. Senate elections.

State PVI Party
in Senate
Alabama 091R+8 Republican
Alaska 085R+14 Both
Arizona 098R+1 Republican
Arkansas 096R+3 Democratic
California 106D+6 Democratic
Colorado 098R+1 Democratic
Connecticut 109D+9 Democratic
Delaware 107D+7 Democratic
District of Columbia 139D+39 n/a
Florida 101D+1 Both
Georgia 093R+6 Republican
Hawaii 109D+9 Democratic
Idaho 080R+19 Republican
Illinois 109D+9 Democratic
Indiana 092R+7 Both
Iowa 101D+1 Both
Kansas 088R+11 Republican
Kentucky 091R+8 Republican
Louisiana 095R+4 Both
Maine 105D+5 Republican
Maryland 110D+10 Democratic
Massachusetts 115D+15 Democratic
Michigan 104D+4 Democratic
Minnesota 103D+3 Democratic
Mississippi 092R+7 Republican
Missouri 098R+1 Both
Montana 088R+11 Democratic
Nebraska 084R+15 Both
Nevada 101D+1 Both
New Hampshire 102D+2 Both
New Jersey 109D+9 Democratic
New Mexico 101D+1 Democratic
New York 115D+15 Democratic
North Carolina 094R+5 Both
North Dakota 086R+13 Democratic
Ohio 099R+0 Both
Oklahoma 087R+12 Republican
Oregon 103D+3 Democratic
Pennsylvania 103D+3 Both
Rhode Island 115D+15 Democratic
South Carolina 092R+7 Republican
South Dakota 089R+10 Both
Tennessee 096R+3 Republican
Texas 091R+8 Republican
Utah 077R+22 Republican
Vermont 108D+8 Democratic
Virginia 096R+3 Democratic
Washington 104D+4 Democratic
West Virginia 095R+4 Democratic
Wisconsin 102D+2 Democratic
Wyoming 080R+19 Republican

[edit] References

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