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Did super PAC attacks make a difference in 2012 election?

A 2010 U.S. Supreme Court decision opened the door to unlimited spending on elections. Did all that money have an impact on who won?
Here are the 10 most popular general elections in the U.S. Senate and House among super PACs and nonprofits and the results of those elections.
(Results through 10 a.m. ET Thursday on races called by AP.)

NATIONAL

Rank Race Name Total outside spending** % Negative Candidate spending Winner
1 President Barack Obama (D)*
Mitt Romney (R)
$141.5 million
$408.5 million
68.9%
80.5%
$540.8 million
$336.4 million
Obama

SENATE

Rank Race Name Total outside spending** % Negative Candidate spending Winner
1 Virginia Tim Kaine (D)
George Allen (R)
$21 million
$29.8 million
88.6%
93.9%
$18.6 million
$11.5 million
Kaine
2 Wisconsin Tammy Baldwin (D)
Tommy Thompson (R)
$21.6 million
$18.2 million
87.6%
85.5%
$11.7 million
$6 million
Baldwin
3 Ohio Sherrod Brown (D)*
Josh Mandel (R)
$14 million
$20.7 million
84.3%
80.0%
$19.5 million
$12.9 million
Brown
4 Indiana Joe Donnelly (D)
Richard Mourdock (R)
$12 million
$16.3 million
95.9%
74.6%
$3.8 million
$6.8 million
Donnelly
5 Nevada Shelley Berkley (D)
Dean Heller (R)*
$14.6 million
$13.1 million
90.7%
94.0%
$10.2 million
$7.6 million
Heller
6 Montana Jon Tester (D)*
Denny Rehberg (R)
$12.8 million
$11.9 million
87.3%
97.0%
$11.6 million
$7.2 million
Tester
7 Arizona Richard Carmona (D)
Jeff Flake (R)
$8.6 million
$11.7 million
98.4%
68.6%
$4.3 million
$6.7 million
Flake
8 Florida Bill Nelson (D)*
Connie Mack (R)
$4.8 million
$15.2 million
76.2%
64.0%
$12.5 million
$6.3 million
Nelson
9 North Dakota Heidi Heitkamp (D)
Rick Berg (R)
$8.5 million
$7.6 million
88.1%
78.0%
$4.1 million
$4.7 million
Heitkamp
10 Missouri Claire McCaskill (D)*
Todd Akin (R)
$8.2 million
$2.8 million
81.2%
40.0%
$17.4 million
$4.6 million
McCaskill

* incumbent

HOUSE

Rank Race Name Total outside spending** % Negative Candidate spending Winner
1 PA-12 Mark Critz (D)*
Keith Rothfus (R)
$4.1 million
$6 million
76.4%
76.3%
$2.1 million
$1.5 million
Rothfus
2 OH-16 Betty Sue Sutton (D)
Jim Renacci (R)*
$5.2 million
$4.6 million
96.6%
97.0%
$1.6 million
$2.5 million
Renacci
3 MN-8 Rick Nolan (D)
Chip Cravaack (R)*
$5.1 million
$3.9 million
90.8%
95.2%
$536,000
$1.2 million
Nolan
4 IL-17 Cheri Bustos (D)
Bobby Schilling (R)*
$4.3 million
$4.6 million
94.3%
95.6%
$1.4 million
$1.9 million
Bustos
5 CA-7 Ami Bera (D)
Dan Lungren (R)*
$5.3 million
$2.9 million
90.0%
99.2%
$2.7 million
$1.7 million
Bera
6 CA-52 Scott Peters (D)
Brian Bilbray (R)*
$3.6 million
$4.6 million
97.0%
87.1%
$3.5 million
$2.1 million
Peters
7 CA-10 Jose Hernandez (D)
Jeff Denham (R)*
$3.6 million
$4.4 million
93.4%
97.5%
$1.4 million
$2.2 million
Denham
8 TX-23 Pete Gallego (D)
Francisco Canseco (R)*
$4.5 million
$2.8 million
94.2%
95.5%
$1.5 million
$1.9 million
Gallego
9 IL-12 Williams Enyart (D)
Jason Plummer (R)
$3.2 million
$4.2 million
88.5%
95.3%
$733,000
$903,000
Enyart
10 IL-11 Bill Foster (D)
Judy Biggert (R)*
$2.5 million
$4.7 million
99.5%
71.1%
$1.8 million
$1.7 million
Foster

* incumbent

** Total represents combination of outside spending supporting candidate and outside spending opposing candidate’s opponent.

Source: Center for Responsive Politics, Federal Election Commission, Center for Public Integrity analysis. Expenditure totals for 2012 election through Nov. 5. Candidate spending totals through Oct. 17.