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.

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.