In times past, an open U.S. Senate seat would have touched off a stampede among ambitious Georgia Democrats eager to offer for the job. Even against an incumbent, there sometimes was a crowd. The 1972 race, for example, featured 15 Democratic candidates, counting an appointed incumbent who hadnt held office long. But in the new Georgia, with a Republican in the executive mansion and the GOP controlling eight of 13 congressional seats, Democrats seem to be having a hard time finding candidates for the Senate seat that will come open next year. Sen. Zell Millers post is the only one...