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“Iowa’s not quite done yet. They’re still certifying that election result,” Mr. Santorum said while campaigning in South Carolina. “Don’t count us out in Iowa yet.”

In Myrtle Beach, S.C., Rep. Ron Paul of Texas was endorsed by South Carolina state Sen. Tom Davis, which the Paul campaign touted as a “game-changing” event because of the lawmaker’s fiscal conservative credentials in the state.

Mr. Paul, who was absent from the state for most of the end of the week, also announced he collected more than $1 million in online donations Saturday in a “moneybomb” fundraising effort.