(reuters) - COLUMBIA, South Carolina (Reuters) - Republican Mitt Romney climbed into a tie with John McCain three days before a critical presidential primary in Florida, according to a Reuters/C-SPAN/Zogby poll released on Sunday.

Romney, the former Massachusetts governor, wiped out a 3-point McCain advantage overnight to pull into a deadlock with the Arizona senator at 30 percent. The margin of error in the poll is 3.4 percentage points.

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