I noticed no one’s produced a direct comparison of the 2010 and 2008 CNN Exit polls, to see where the swing was the largest/smallest, so I decided to create one.  I used the House totals, and only picked out categories with direct comparisons.  The totals may not represent equal shifts due to voters not responding to certain questions and by changes in the compositions of the categories.  Note that these are exit polls, so they may not reflect the actual electorate, but should be fairly close.  Republican totals are Positive:

Category
Response
Gap 2008
Gap 2010
Difference

Vote by Sex

Male
-6
14
20

Female
-14
1
15

Vote By Race

White
8
23
15

Black
-88
-80
8

Latino
-41
-22
19

Asian
-32
-18
14

Other
-45
-9
36

Vote by Race

White Male
11
28
17

White Female
6
19
13

Black Male
-84
-73
11

Black Female
-90
-86
4

Latino Male
-41
-11
30

Latino Female
-38
-32
6

Other
-40
-13
27

Vote by Age

18-29
-29
-13
16

30-44
-9
4
13

45-64
-5
8
13

65 and older
-1
21
22

Vote by Income

Less than 50,000
-26
-11
15

50,000-100,000
-3
9
12

100,000 and up
2
18
16

Vote by Income and race

White<50,000
-1
12
13

Whites >50,000
12
24
12

Non-whites <50,000
-74
-61
13

Non-whites >50,000
-53
-40
13

Vote by Education

No High school
-37
-21
16

H.S Graduate
-12
6
18

Some College
-8
10
18

College Graduate
-2
18
20

Post Graduate
-14
-12
2

College Graduate?

Yes
-7
8
15

No
-17
7
24

Vote by Education and Race

White College
6
19
13

Whites-No College
10
30
20

Non-White College
-56
-42
14

Non-Whites-No College
-68
-52
16

Vote by Party Id

Democrat
-85
-84
1

Republican
80
89
9

Independent
-8
19
27

Vote by Ideology

Liberal
-76
-82
-6

Moderate
-24
-13
11

Conservative
52
71
19

Vote by Religion

Protestant
8
21
13

Catholic
-13
10
23

Jewish
-62
NA
NA

Other
-55
-50
5

None
-47
-38
9

Religion among Whites

White Protestant
28
41
13

White Catholic
6
20
14

White Jewish
-66
NA
NA

White other
-37
-43
-6

White No Religion
-38
-25
13

Non-White
-66
-51
15

White Evangelical

Yes
42
58
16

No
-27
-13
14

Attend Church Weekly?

Yes
8
18
10

No
-22
-9
13

Children under 18

Yes
-9
4
13

No
-11
4
15

Union Member?

Yes
-30
-24
6

No
-3
11
14

Gay, Lesbian, Bisexual

Yes
-61
-40
21

No
-9
6
15

Vote for President in 2008

Obama
-82
-70
12

McCain
74
84
10

Other
NA
24
NA

Vote by Size of Place

Urban
-29
-15
14

Suburban
-3
13
16

Rural
0
24
24

Opinion of Government

Should do more
-53
-56
-3

Should do less
38
56
18

Vote by Region

North East
-23
-10
13

Midwest
-8
9
17

South
2
24
22

West
-19
-1
18