Rick Perry, though I don't quite get why Newt Gingrich collapsed.
easy, they remembered who he was.
Exactly. When Gingrich surged everyone with any level of political memory was dumbfounded as to how such an insider with tons of baggage could be appealing to the anti-Washington mood of 2011 GOP politics. The answer was that they either had forgotten or were unaware of how he was and were just reacting to his 2011 debate performances. His support was never real to begin with.
It was just another example of how badly the base want someone besides Romney. And the Santorum boomlet only reinforces that