He needs to get out of the race and let Grinrich beat Romney.
Anyone who takes an objective look at Gingrich and Romney as candidates against Obama and his smear machine will come to the conclusion that Romney will have a tough time beating Obama, and Gingrich would be chewed up and spit out by a nasty campaign focused on his past, which, of course, it will be. Gingrich is a terrible National candidate who is thoroughly dislikeable. That might be OK within conservative circles but it is not with the majority of the electorate.