Unfortunately (as someone supporting Gingrich) you are spot on in your analysis.
Newt did not have a remarkable night, Santorum was the best he ever been and that only hurts Newt.
Romney scored style points early in the debate on Newt during the immigration questions when the most viewers would be watching.
Personally I found a new level of disgust with Romney as the night went on and was very disappointed in a horribly moderated debate. Very frustrated that Newt was never able to get on issues for any length of time and there was no focus on the failures of Zero.