As you probably know, judging by your comment, the reason that Gingrich had to step down originally was essentially because the GOP establishment stopped supporting him. They were actually embarrassed by his success and considered him “divisive,” and they couldn’t wait to get Dodd (IIRC) into his position.
Oh yes, I know, one can always count on the GOP for support when one is in trouble, much like Herman Cain got their support.
But, Newt, along with Bob Livingston, and others seem so eager to step down as soon as anything is said.
Whereas democrats almost never give up a seat, because a seat = power...except of course in the case of Weiner, which was anunusual exception to the rule.