Eight Democrats and four Republicans have filed to run against Sen. Bob Corker (R-Tenn.) as he seeks a second term in the Senate.

Notable on the Democratic side is Park Overall, a Broadway and screen actress and a prominent environmental activist, the Knoxville News Sentinel reported. On the GOP side, two Tea Party candidates and two others will challenge Corker in the primary.

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Unseating Corker will be an uphill slog for any candidate — especially when it comes to raising enough cash to be competitive. Corker had almost $7.4 million saved up for his reelection as of the end of 2011.

Corker has also been floated as a possible vice presidential pick, and didn’t rule out the prospect when asked about it on Thursday, according to the Chattanooga Times Free Press.