Sister of Stephen Colbert to run for Rep. Tim Scott's seat

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Former Gov. Mark Sanford, South Carolina state Sen. Larry Grooms, state Rep. Chip Limehouse and former state Sen. John Kuhn have all either announced their bids or are expected to do so in the coming days.

The deadline for all candidates to enter the race is Jan. 28, and more Democratic names could emerge in the coming days.

--This post was updated at 3 p.m.