Like every great sales pitch, Mitt Romney's case for Mitt Romney is low on the hard sell. At the Sheraton Hotel here one recent morning, the boasting is handled by a former governor of South Carolina, who opens this "Ask Mitt Anything" session with a precis of the candidate's career. This includes academic achievements (Harvard Law School and Harvard Business School "in four years!") and election as governor of Massachusetts in 2002, which is described in a tone befitting a miracle. "He ran for governor in the bluest state of all blue states," says James Edwards, "the bluest state you...