BURLINGTON, Vt. (Reuters) - Former President Jimmy Carter will offer support for Democratic White House hopeful Howard Dean in a joint appearance in Georgia on the eve of the Iowa caucuses, campaign aides said on Tuesday. Carter was expected to remain officially neutral, but words of praise could help boost the former Vermont governor's chances when the race turns to the South on Feb. 3. Dean's campaign headquarters announced later that the Democratic front-runner would leave Iowa to attend services and Sunday school at Maranatha Baptist Church in Plains, Georgia, where Carter worships. "This event is not expected to be...