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CHARLESTON, S.C. (AP) - No joke: comedian Stephen Colbert's sister isrunning in earnest for a vacant South Carolina congressional seat.

Campaign manager Bill Romjue said Friday that Elizabeth Colbert-Bushplans to file next week and make a formal announcement. She did notimmediately return messages from The AP.

Colbert-Busch will file as a Democrat seeking the 1st District seat leftvacant when Gov. Nikki Haley appointed Tim Scott as the state's newestU.S. senator. Colbert-Bush is a Charleston native like her brother anddevelopment director at the Clemson University Restoration Institute innearby North Charleston.

One other Democrat and at least 10 Republicans are seeking the seatalong South Carolina's south coast. GOP candidates include former Gov.Mark Sanford.

The primaries are March 19, runoffs on April 2 and special election May 7.

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