Last week, Cain trailed Obama by three. The week before, he was behind by five. “Cain now has the chance to make the case for why he should be the challenger to Mitt Romney,” says Scott Rasmussen, president of Rasmussen Reports. “Many others have auditioned for the role and fallen flat, and it remains to be seen whether Cain’s fate will be similar.” Rasmussen interviewed Cain for the Rasmussen Report on radio show…

Rick Perry is the only other GOP candidate to have ever held a lead against the president in this cycle. That came just as the Texas governor entered the race when he was widely perceived as the front-runner. Perry now trails Obama by double digits.