The Cook Partisan Voting Index (CPVI), sometimes referred to as simply the Partisan Voting Index (PVI), is an estimate of how strongly an American congressional district leans toward one political party compared to the nation as a whole. It was originally 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 the presidential election results in that district from the prior two elections, then comparing them to how the nation voted as a whole. The index indicates the more successful political party and how many percentage points higher than the national average for that party. It is published as a letter + number combination. In the following list the numbers range from D+43 (for New York's 15th and 16th districts) to R+26 (for Utah's 1st district). The statewide numbers range from R+22 for Utah to D+15 for Massachusetts, New York and Rhode Island (and D+39 for the District of Columbia).

Examples

A CPVI score of R+2 shows the Republicans received an average of 2 percentage points more votes than the national average. Likewise, a CPVI score of D+3 shows the Democrats received an average of 3 percentage points more votes than the national average.

List of PVIs by congressional district^[1]

Alabama

1st--R+12
2nd--R+13
3rd--R+4
4th--R+16
5th--R+6
6th--R+25
7th--D+17
Alabama overall--R+8

Alaska

At Large--R+14

Arizona

1st--R+2
2nd--R+9
3rd--R+6
4th--D+14
5th--R+4
6th--R+12
7th--D+10
8th--R+1
Arizona overall--R+1

Arkansas

1st--D+1
2nd--R+0
3rd--R+11
4th--D+0
Arkansas overall--R+3

California

1st--D+10
2nd--R+13
3rd--R+7
4th--R+11
5th--D+14
6th--D+21
7th--D+19
8th--D+36
9th--D+38
10th--D+9
11th--R+3
12th--D+22
13th--D+22
14th--D+18
15th--D+14
16th--D+16
17th--D+17
18th--D+3
19th--R+10
10th--D+5
21st--R+13
22nd--R+16
23rd--D+9
24th--R+5
25th--R+7
26th--R+4
27th--D+13
28th--D+25
29th--D+12
30th--D+20
31st--D+30
32nd--D+17
33rd--D+36
34th--D+23
35th--D+33
36th--D+11
37th--D+27
38th--D+20
39th--D+13
40th--R+8
41st--R+9
42nd--R+10
43rd--D+13
44th--R+6
45th--R+3
46th--R+6
47th--D+5
48th--R+8
49th--R+10
50th--R+5
51st--D+7
52nd--R+9
53rd--D+12
California overall--D+6

Colorado

1st--D+18
2nd--D+8
3rd--R+6
4th--R+9
5th--R+16
6th--R+10
7th--D+2
Colorado overall--R+1

Connecticut

1st--D+14
2nd--D+8
3rd--D+12
4th--D+5
5th--D+4
Connecticut overall--D+9

Delaware

At Large--D+7

District of Columbia

At Large--D+39

Florida

1st--R+19
2nd--R+2
3rd--D+16
4th--R+16
5th--R+5
6th--R+8
7th--R+3
8th--R+3
9th--R+4
10th--D+1
11th--D+11
12th--R+5
13th--R+4
14th--R+10
15th--R+4
16th--R+2
17th--D+35
18th--R+4
19th--D+21
20th--D+18
21st--R+6
22nd--D+4
23rd--D+29
24th--R+3
25th--R+4
Florida overall--D+1

Georgia

1st--R+14
2nd--D+2
3rd--R+19
4th--D+22
5th--D+25
6th--R+19
7th--R+19
8th--R+8
9th--R+24
10th--R+14
11th--R+16
12th--D+2
13th--D+10
Georgia overall--R+6

Hawaii

1st--D+7
2nd--D+10
Hawaii overall--D+9

Idaho

1st--R+19
2nd--R+19
Idaho overall--R+19

Illinois

1st--D+35
2nd--D+35
3rd--D+10
4th--D+31
5th--D+18
6th--R+3
7th--D+35
8th--R+5
9th--D+20
10th--D+4
11th--R+1
12th--D+5
13th--R+5
14th--R+5
15th--R+6
16th--R+4
17th--D+5
18th--R+5
19th--R+8
Illinois overall--D+9

Indiana

1st--D+8
2nd--R+4
3rd--R+16
4th--R+17
5th--R+20
6th--R+11
7th--D+9
8th--R+9
9th--R+7
Indiana overall--R+7

Iowa

1st--D+5
2nd--D+7
3rd--D+1
4th--D+0
5th--R+8
Iowa overall--D+1

Kansas

1st--R+20
2nd--R+7
3rd--R+4
4th--R+12
Kansas overall--R+11

Kentucky

1st--R+10
2nd--R+13
3rd--D+2
4th--R+12
5th--R+8
6th--R+7
Kentucky overall--R+8

Louisiana

1st--R+18
2nd--D+28
3rd--R+5
4th--R+7
5th--R+10
6th--R+7
7th--R+7
Louisiana overall--R+4

Maine

1st--D+6
2nd--D+4
Maine overall--D+5

Maryland

1st--R+10
2nd--D+8
3rd--D+7
4th--D+30
5th--D+9
6th--R+13
7th--D+25
8th--D+20
Maryland overall--D+10

Massachusetts

1st--D+15
2nd--D+11
3rd--D+11
4th--D+17
5th--D+9
6th--D+10
7th--D+18
8th--D+31
9th--D+15
10th--D+8
Massachusetts overall--D+15

Michigan

1st--R+2
2nd--R+9
3rd--R+9
4th--R+3
5th--D+12
6th--R+2
7th--R+2
8th--R+2
9th--R+0
10th--R+0
11th--R+1
12th--D+13
13th--D+32
14th--D+33
15th--D+13
Michigan overall--D+4

Minnesota

1st--R+1
2nd--R+3
3rd--R+1
4th--D+13
5th--D+21
6th--R+5
7th--R+6
8th--D+4
Minnesota overall--D+3

Mississippi

1st--R+10
2nd--D+10
3rd--R+13
4th--R+16
Mississippi overall--R+7

Missouri

1st--D+26
2nd--R+9
3rd--D+8
4th--R+11
5th--D+12
6th--R+5
7th--R+14
8th--R+11
9th--R+7
Missouri overall--R+1

Montana

At Large--R+11

Nebraska

1st--R+11
2nd--R+9
3rd--R+24
Nebraska overall--R+15

Nevada

1st--D+9
2nd--R+8
3rd--D+1
Nevada overall--D+1

New Hampshire

1st--R+0
2nd--D+3
New Hampshire overall--D+2

New Jersey

1st--D+14
2nd--D+4
3rd--D+3
4th--R+1
5th--R+4
6th--D+12
7th--R+1
8th--D+12
9th--D+13
10th--D+34
11th--R+6
12th--D+8
13th--D+23
New Jersey overall--D+9

New Mexico

1st--D+2
2nd--R+6
3rd--D+6
New Mexico overall--D+1

New York

Some New York districts directly affected by 9-11 were more likely to vote for Bush in 2004 than in 2000. Most of the city districts in Staten Island, the outer boroughs, and Long Island, specifically NY-03 and NY-13, showed marked increases for the incumbent President in the 2004 election; the 2008 election should show whether it was a temporary or permanent shift to the Republicans. Similar results were shown in parts of New Jersey and Connecticut.

1st--D+3
2nd--D+7
3rd--D+2
4th--D+9
5th--D+18
6th--D+38
7th--D+28
8th--D+28
9th--D+14
10th--D+41
11th--D+40
12th--D+34
13th--D+1
14th--D+26
15th--D+43
16th--D+43
17th--D+21
18th--D+10
19th--R+1
20th--R+3
21st--D+9
22nd--D+6
23rd--R+0
24th--R+1
25th--D+3
26th--R+3
27th--D+7
28th--D+15
29th--R+5
New York overall--D+15

North Carolina

1st--D+9
2nd--R+3
3rd--R+15
4th--D+6
5th--R+15
6th--R+17
7th--R+3
8th--R+3
9th--R+12
10th--R+15
11th--R+7
12th--D+11
13th--D+2
North Carolina overall--R+5

North Dakota

At Large--R+13

Ohio

1st--R+1
2nd--R+13
3rd--R+3
4th--R+14
5th--R+10
6th--D+0
7th--R+6
8th--R+12
9th--D+9
10th--D+6
11th--D+33
12th--R+1
13th--D+6
14th--R+2
15th--R+1
16th--R+4
17th--D+14
18th--R+6
Ohio overall--R+0

Oklahoma

1st--R+13
2nd--R+5
3rd--R+18
4th--R+13
5th--R+12
Oklahoma overall--R+12

Oregon

1st--D+6
2nd--R+11
3rd--D+18
4th--D+0
5th--D+1
Oregon overall--D+3

Pennsylvania

1st--D+36
2nd--D+39
3rd--R+2
4th--R+3
5th--R+10
6th--D+2
7th--D+4
8th--D+3
9th--R+15
10th--R+8
11th--D+5
12th--D+5
13th--D+8
14th--D+22
15th--D+2
16th--R+11
17th--R+7
18th--R+2
19th--R+12
Pennsylvania overall--D+3

Rhode Island

1st--D+16
2nd--D+13
Rhode Island overall--D+15

South Carolina

1st--R+10
2nd--R+9
3rd--R+14
4th--R+15
5th--R+6
6th--D+11
South Carolina overall--R+7

South Dakota

At Large--R+10

Tennessee

1st--R+14
2nd--R+11
3rd--R+8
4th--R+3
5th--D+6
6th--R+4
7th--R+12
8th--D+0
9th--D+18
Tennessee overall--R+3

Texas

1st--R+17
2nd--R+12
3rd--R+17
4th--R+17
5th--R+16
6th--R+15
7th--R+16
8th--R+20
9th--D+21
10th--R+13
11th--R+25
12th--R+14
13th--R+18
14th--R+14
15th--D+3
16th--D+9
17th--R+18
18th--D+23
19th--R+25
20th--D+8
21st--R+13
22nd--R+15
23rd--R+4
24th--R+15
25th--D+1
26th--R+12
27th--R+1
28th--R+1
29th--D+8
30th--D+26
31st--R+15
32nd--R+11
Texas overall--R+8

Utah

1st--R+26
2nd--R+17
3rd--R+22
Utah overall--R+22

Vermont

At Large--D+8

Virginia

1st--R+9
2nd--R+6
3rd--D+18
4th--R+5
5th--R+6
6th--R+11
7th--R+11
8th--D+14
9th--R+7
10th--R+5
11th--R+1
Virginia overall--R+3

Washington

1st--D+7
2nd--D+3
3rd--D+0
4th--R+13
5th--R+7
6th--D+6
7th--D+30
8th--D+2
9th--D+6
Washington overall--D+4

West Virginia

1st--R+6
2nd--R+5
3rd--D+0
West Virginia overall--R+4

Wisconsin

1st--R+2
2nd--D+13
3rd--D+3
4th--D+20
5th--R+12
6th--R+5
7th--D+2
8th--D+0
Wisconsin overall--D+2

Wyoming

At large--R+19

References