Said this before, but given his role in the 1994 conservative revival in Congress, the eventual Gingrich endorsement of Trump will cause the right much, much more grief than tough-guy opportunist Chris Christie’s has. He blamed Marco Rubio for some of that mudslinging, saying the Florida senator’s personal attacks on Trump after last Thursday’s debate may have backfired. “I suspect it hurt Rubio,” Gingrich says. “Rubio’s not an attack dog. Chris Christie’s an attack dog. Christie knows how to do that, Rubio doesn’t. And Rubio ends up, I think, looking silly.”Gingrich also chided Republicans suggesting they won’t get behind Trump...