Loudermilk, a state senator from Cassville, defeated former congressman Bob Barr in a GOP runoff Tuesday for Gingrey's House seat in the 11th District, which covers part of Atlanta's northern suburbs. Barr, who helped lead the 1998 impeachment of President Bill Clinton, was denied a congressional comeback more than a decade after he became a casualty of a redistricting that forced him into a losing primary race against a fellow GOP incumbent, then-Rep.