** FILE ** Democratic U. S. Rep. John Yarmuth speaks at a news conference in Louisville, Ky., Tuesday, April 29, 2008.  Four Republicans are running in the primary election for the opportunity to challenge Yarmuth in the fall.  (AP Photo/David Harpe)
** FILE ** Democratic U. S. Rep. John Yarmuth speaks at a news conference in Louisville, Ky., Tuesday, April 29, 2008. Four Republicans are running in the primary election for the opportunity to challenge Yarmuth in the fall. (AP Photo/David Harpe) AP
** FILE ** Democratic U. S. Rep. John Yarmuth speaks at a news conference in Louisville, Ky., Tuesday, April 29, 2008. Four Republicans are running in the primary election for the opportunity to challenge Yarmuth in the fall. (AP Photo/David Harpe) AP