He doesn’t have a path. Neither does Rick. Their best chance is to take delegates where they can from Romney.
If Newt stays in:
Newt delegates + Rick delegates > Romney delegates (hopefully)
If Newt drops out:
1/2 of Newt delegates + Santorum delegates < Romney delegates + the other half of Newt delegates
delegates = to date + prospective.
Please quote the official Republican Party circular through the RNC or State Parties, which has gone out to all Gingrich voters in all states which have yet to hold a primary or caucus, mandating that said voters, under penalty of punishment, must cast a vote either for Santorum or Romney, in the event Gingrich has dropped out, and that said circulars were sent out with such a 50/50 split apportioned to the Gingrich voters, ie. for every letter mandating a Santorum vote another letter for another Gingrich voter mandated a Romney vote. How can you say or predict what those voters will precisely, mathematically do? How about if 90% of them sour on Romney? How about if “Romney voters” which are not generally “the base” and not as fired up, get “Romney Fatigue” and start to dip in their turnout, but social conservatives/more conservative voters stay firm or increase in future states due to some hot button, rousing media cycle issue that surfaces? Romney is not a hot, popular commodity in the first place. I can just as easily say the indications are that if conservatives unite behind one candidate as the final “anti-Romney which had always been the plan, there is Conservative grassroots buzz again and media excitement and still time to block him, perhaps a one-on-one Super Last Chance Debate arranged, who knows? But only in trying that will we know for certain. I do know as it stands, so far, Gingrich along with Paul cannot even have his name placed in nomination (though he does have delegates he could release, and should do so urging them to vote for the conservative left standing to beat Romney).