Hmm.
I would say (out of 4 ****)
Newt *** (obviously tired, and at the end of a LONG day)
Romney ** 1/2 (the tax question really got him, and no big applause moments like Newt had with question #1)
Santorum 1/2 * - completely and deservedly lost any hope with his petty, smarmy and vicious performance tonight.
Paul 1/2 * - Did better than usual because I don’t remember him whining about Iran. Still a universe away from being acceptable as a candidate.
Totally agree with your assessments and for the reasons:1. Newt, Mitt, Santorum, Paul