see, "republican candidate" isn't a mormon, isn't a RINO, isn't a moron from alaska, isn't running an anti-gay clinic, isn't citing lady gaga lyrics randomly, and doesn't do a whole lot to alienate anyone. So it's easy to be the perfect anti-obama when you're 0% polarizing.
It's like saying "Generic food beats broccoli by 8 points!" I mean, once people realize the "generic food" is Alpo, people might decide to stick with broccoli.