On February 20, James Traficant said on his radio show that he is no longer a Democrat, that he is an independent, and that he may run for Congress this year. See this story. Thanks to Carter Momberger for the link. Traficant was a 9-term Democratic member of Congress from Ohio.
Also see this story, which says that Traficante is too late to get his name on any primary ballot in any event, but he is free to file as an independent if he does so by early May. He would need about 2,500 signatures in the typical U.S. House district.