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The real story of the 2010 midterm elections wasn’t the tea party, but instead the rise of deep-pocketed, secretive outside groups that spent nearly $300 million to influence last night’s (and this morning’s) results. These groups have anodyne names like American Crossroads or American Action Network or the Alliance for America’s Future, and more importantly, don’t have to disclose who’s pumping cash into their war chests. They’re mostly right-wing: conservative outside groups outspent lefty groups by a more than two-to-one margin, $187 million to $90 million, according to the Center for Responsive Politics. But not all of the outside groups are new to politics. The US Chamber of Commerce, which has been intervening in congressional races for years, was one of the biggest independent spenders in this year’s election, throwing tens of millions of dollars at races from California to New Hampshire.

So how much bang did these shadowy groups, some of which don’t have to disclose their donors until well after Election Day (if at all), get for their buck?

Below, we take a look at the five biggest outside spenders, as measured by the Center for Responsive Politics, and whether their top ten spending efforts—either in favor of or against a particular candidate—paid off at the ballot box on Tuesday. (Successful opposition or support is bolded in each table.)

US Chamber of Commerce Total spending: $33 million Candidate State Race Spending Result Barbara Boxer (D) CA Senate $4.9 million against Boxer win Michael Bennet (D) CO Senate $2 million against Bennet win Charlie Crist (I) FL Senate $2 million against Crist loss Alex Giannoulias (D) IL Senate $1.7 million against Giannoulias loss Paul Hodes (D) NH Senate $1.7 million against Hodes loss Joe Sestak (D) PA Senate $1.5 million against Sestak loss Robin Carnahan (D) MO Senate $1.4 million against Carnahan loss Jack Conway (D) KY Senate $1.3 million against Conway loss Dino Rossi (R) WA Senate $997,000 for Rossi loss Kelly Ayotte (R) NH Senate $997,000 for Ayotte win Batting Average: .700

American Action Network Total spending: $26 million Gerry Connolly (D) VA House $1.8 million against Connolly win Ed Perlmutter (D) CO House $1.5 million against Perlmutter win Bryan Lentz (D) PA House $1.4 million against Lentz loss Stephanie Herseth Sandlin (D) SD House $1.1 million against Sandlin loss Mark Critz (D) PA House $1 million against Critz won Charlie Wilson (D) OH House $1 million against Wilson loss Chris Murphy (D) CT House $1 million against Murphy win Martin Heinrich (D) NM House $1 million against Heinrich win Russ Feingold (D) WI Senate $910,000 against Feingold loss Paul Hodes (D) NH Senate $875,000 against Hodes loss Batting average: .500

American Crossroads Total spending: $21.5 million Michael Bennet (D) CO Senate $5.1 million against Bennet win Robin Carnahan (D) MO Senate $2.3 million against Carnahan loss Marco Rubio (R) FL Senate $1.6 million for Rubio win Jack Conway (D) KY Senate $1.4 million against Conway loss Harry Reid (D) NV Senate $1.2 million against Reid win Alex Giannoulias (D) IL Senate $1.1 million against Giannoulias loss Ken Buck (R) CO Senate $838,000 for Buck loss Ami Bera (D) CA House $682,000 against Bera loss Paul Hodes (D) NH Senate $658,000 against Hodes loss Patty Murray (D) WA Senate $558,000 against Murray win Batting average: .600

Crossroads GPS Total spending: $17.1 million Alex Giannoulias (D) IL Senate $4.5 million against Giannoulias loss Patty Murray (D) WA Senate $3.6 million against Murray win Harry Reid (D) NV Senate $2.3 million against Reid win Jack Conway (D) KY Senate $1.1 million against Conway loss Joe Sestak (D) PA Senate $809,000 against Sestak loss Robin Carnahan (D) MO Senate $714,000 against Carnahan loss John Boccieri (D) OH House $447,000 against Boccieri win Charlie Crist (I) FL Senate $354,000 against Crist loss Marco Rubio (R) FL Senate $353,000 for Rubio win Jim Costa (D) CA House $337,000 against Costa loss Batting average: .800

Service Employees’ International Union Total spending: $15.7 million Scott Murphy (D) NY House $942,000 for Murphy loss James Renacci (R) OH House $502,000 against Renacci win Bill Owens (D) NY House $491,000 for Owens win Bobby Schilling (R) IL House $481,000 against Schilling win Tim Walberg (R) MI House $416,000 against Walberg win Dina Titus (D) NV House $354,000 for Titus loss Michael Fitzpatrick (R) PA House $325,000 against Fitzpatrick win Robert Hurt (R) VA House $318,000 against Hurt win Sara Feigenholtz (D) IL House $274,000 for Feigenholtz win Macdonald D’Alessandro (D) MA House $250,000 for D’Alessandro primary loss Batting average: .200

So there you have it. The US Chamber of Commerce and the Karl Rove-launched Crossroads GPS led the way, with .800 and .700 averages, respectively, in making the most of their (mostly) attack dollars. The labor group SEIU, meanwhile, finished last, albeit in an incredibly GOP-friendly election year. (Unlike the Chamber or many other outside groups, unions such as the SEIU do have to disclose most of their donors.) Most of these groups’ funds, as you can tell, were focused on US Senate races around the country. And while the aforementioned conservative groups had plenty of success knocking off Democrats east of the Mississippi, their cash had far less influence out west, where Democratic incumbents Harry Reid, Michael Bennet, Barbara Boxer, and (probably) Patty Murray swatted away their challengers to eke out narrow wins on Election Day.