Here's a hoot, since we're talking about all the candidates here. Today, USA/Gallup released a poll showing Romney & Cain in a dead heat. Here 'tis.
Thing is, look at the undecided voters. Looks like if you're a Perry person, then when he started getting goofy then you just went to the undecided column, which is where you are today.
Gotta keep in mind all these polls were taken before the chubby blond took Cain''s knees out from under him.