Outside spenders' return on investment - Sunlight Foundation Reporting Group:
Why I feel vindicated in my analysis that Citizens United probably didn't make any difference. The link above has full details.
"Turns out some of the smart money wasn't so smart after all when it came to making political bets. This year, the pro-business GOP Crossroads fundraising combine and the U.S. Chamber of Commerce weren't as good at picking winners as the labor movement, which appears to be one of the surprise winners of Election Day."
'via Blog this'