Sen.-elect Angus King of Maine (far right) joins newly elected Democratic senators and Senate Majority Leader Harry Reid on Capitol Hill on Wednesday. From left: Joe Donnelly of Indiana, Tim Kaine of Virginia, Mazie Hirono of Hawaii, Reid, and Elizabeth Warren of Massachusetts. Harry Hamburg/AP hide caption

itoggle caption Harry Hamburg/AP

Karl Rove, former adviser to President George W. Bush, speaks last year in Corpus Christi, Texas. Rove is the chief fundraiser for the biggest outside spender this election season: the twin groups American Crossroads and Crossroads GPS. Michael Zamora/AP hide caption

itoggle caption Michael Zamora/AP

Former Maine Gov. Angus King, an independent candidate for the U.S. Senate, greets potential voters Oct. 1 in Bath, Maine. Joel Page/AP hide caption

itoggle caption Joel Page/AP