SOLANA BEACH ---- A former National Football League defensive back and punt returner has entered the GOP sweepstakes to fill out the unexpired term of Randy "Duke" Cunningham. Scott Turner, 33, a political neophyte, made his announcement Tuesday from a makeshift lectern placed on the 50-yard line at Santa Fe Christian School's Beauchamp Stadium. Flanked by his wife, Robin, Turner said he's in the 50th Congressional District race despite naysayers who, he said, have told him he needs a Hail Mary-type completion to overcome his better-financed and more experienced rivals. "Many have already tried to dissuade me from one, running...