American Crossroads spent heavily, not just on Romney, but on attack ads on behalf of GOP Senate candidates in eight states — thanks to mega contributions from conservative donors like metals magnate Harold Simmons ($19.5 million), Texas homebuilder Bob Perry ($7.5 million) and Omni hotel chief Robert Rowling ($5 million.)

The super donors didn’t get much for their money. Six of the eight GOP Senate candidates that American Crossroads spent money to try to elect – Tommy Thompson in Wisconsin, George Allen in Virginia, Josh Mandel in Ohio, Richard Mourdock in Indiana, Denny Rehberg in Montana and Todd Akin in Missouri – lost their races, along with Romney. The group did, on the other hand, help to elect Deb Fischer in Nebraska and Dean Heller in Nevada.