What must have Romney really worried is that the second choices for the Cain and Perry supporters are each other. Hardly any of their supporters will move to Romney iftheir favorite drops out.
exactly ... and then add to that all the Santorum and Bachmann voters, most of the Paul voters and, probably, the majority of the Gingrich voters. But there is a consolation prize: Mitt will get all (both?) of the Huntsman voters.