“Why should he quit? His percentage won’t make a bit of difference to Newt or Santorum. Go after either Newt or Santorum to quit if you want to make the arguement that Romney will win unless they do. Perry isn’t sucking oxygen out of anyone’s campaign and he has a lot to say.”
Iowa was decided by 8 votes so every vote counts. Also, I’m pretty sure there are Perry financial backers who are withholding support from others because they don’t want to insult Perry.
The Perry backers backed Perry because of who he is, they will not be financially backing anyone else until, perhaps, the general.