What it will take to get Newt Gingrich to quit: 4 theories

The former House speaker is under heavy pressure to give up his bid for the GOP presidential nomination. Will he crack?

Newt Gingrich is clinging to his presidential bid, despite only winning two primaries, in South Carolina and his native state of Georgia.
(Image credit: Mark Wallheiser/Getty Images)

As Mitt Romney's aura of inevitability grows, and conservatives yearn for Rick Santorum to get one last chance to challenge Romney one on one, Newt Gingrich is facing mounting calls to drop out of the race for the Republican presidential nomination. The former House speaker insists that he intends to stick around and pick up enough delegates to keep Romney from collecting the 1,144 he needs to seize the nomination outright. But Romney backer and 1996 GOP nominee Bob Dole says Gingrich's campaign is "probably finished, or almost finished," and many party insiders agree. What will it take for Newt to quit? Here, four theories:

1. He'll quit when he runs out of cash

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