I don't see Romney as a strong candidate at all. He looked good next to Michele Bachmann and Herman Cain, but that's not much of an accomplishment. His silver spoon syndrome, hardline immigration stance (self deportation) combined with Clinton nostalgia and the fact that some white people who couldn't get over their racial hangups about Obama would have no problem voting for Hillary makes me think this would be a landslide. The GOP is probably much better off with Jeb, Walker, or Christie (assuming the latter two survive their problems).
Clinton - 402
Romney - 136