If Newt Gingrich drops out of the GOP primary after losing in Alabama and Mississippi yesterday, it could enable Rick Santorum to unite conservatives against Mitt Romney. Though Romney is still the favorite for the nomination, it’s conceivable that a head-to-head contest could ensure it drags on longer, perhaps damaging Romney further for the general election.

The key question is whether the pro-Newt super PAC will be able to continue operating. The super PAC’s operations have been largely funded by billionaire casino magnate Sheldon Adelson, whose money has effectively kept Gingrich’s candidacy afloat.

John Harwood of the New York Times last night quoted a friend of Adelson saying that he had written his “last check.”

I just checked in with Rick Tyler, the head of the pro-Newt super PAC . Asked if he could continue operating without Adelson’s money, Tyler conceded: “Fundraising will be challenging.”

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