Rick Santorum's campaign is asking for an investigation of what it called the "backroom deal" that resulted in a narrow delegate victory for Mitt Romney in Michigan's Republican primary on Tuesday. In a letter to the Republican National Committee's legal counsel, the Santorum campaign's chief lawyer claims the Michigan Republican Party improperly awarded both of the at-large delegates to Romney, instead of splitting them between the two candidates. "It is our understanding that several public supporters and Michigan surrogates of an opposing campaign voted in favor of the delegate allocation change which assisted their chosen candidate," Santorum's general counsel Cleta...