Perry’s take, via the Des Moines Register:

“This is a long election. This is the first, let’s say ‘Mile one’ of the marathon,” he said. “I’ve run a marathon before and I felt great at mile one. As a matter of fact, I felt pretty great at mile 17 and 18. But at mile 21, you start kind of hitting that wall a little bit. And we’ll see who’s still running at mile 21.”