SAVANNAH — While Republicans in eastern Georgia say they're more committed than ever to defeating Democratic U.S. Rep. John Barrow in the fall elections, GOP voters may have a tougher time than expected choosing a nominee in the primary. Barrow of Augusta won re-election to Congress in 2012 even after his 12th District seat was redrawn to favor Republicans. He's the last white Democrat from the Deep South remaining in the U.S. House, and the national GOP has made him a top target this year.