Yes, but Newt had infidelity issues, so it was more important to raise a stink over that than to have an acceptably conservative nominee.
Anything else Newt has done, Santorum and the others have committed political sins equally as bad—e.g. Dede Scozzafava :: Arlen Specter, posing with Nancy Pelosi :: teaming up with Hillary Clinton… so on, so forth.
Sorry, not even close. Gingrich has more baggage than the Atlanta Terminal. If they were all exposed to the general public, they would flee from him like they would a dead skunk. Even if you believe he is a solid conservative, he is a terrible candidate, especially against a ruthless machine that will make the most of his tawdry past, and I'm including in this his fronting for Fannie and Freddie when they were destroying our economy. Can you imagine what Jamie Goerlick would have to say about Gingrich's role with them? He'd be toast.