Rudy Giuliani’s campaign has scheduled “Major endorsement announcement” in Charleston, South Carolina at 1:30 p.m. tomorrow. Any South Carolinians got any guesses on who the endorser might be?

UPDATE: From the Giuliani campaign’s e-mail to reporters today: “Get excited, big new endorsement.”

ANOTHER UPDATE: One of my South Carolina readers notes, “the only major unaligned player in SC is Gov. Mark Sanford. And he does live in Charleston.”

That would indeed be a big endorsement. Sanford endorsed McCain in 2000.

YET ANOTHER UPDATE: A Giuliani aide confirms it’s not Sanford. And I’m now told that the event is in South Carolina for scheduling reasons, not because of a South Carolina tie. Ah, much bigger pool of suspects, then…