Newt’s own base is conservative, and he irritated them when he endorsed her. Better he’d stayed out of it.
As for hasty endorsements...Newt? Leave me some shred of illusion, that Newt Gingrich is not an amateurish, impulsive, foolish, or slipshod player.
Yeah, Newt can be all that, as in this case. And it really bit him.