Vermont U.S. Sen. Bernie Sanders' increasingly narrow path to the Democratic presidential nomination rests almost entirely on persuading a group of party elites who hold a vote at the summer's convention to flip their support from Hillary Clinton.

That tactic has gotten little traction in Georgia, home to a chunk of superdelegates who have already committed to Clinton — and a handful of big-name Democrats who have yet to make up their minds. The biggest is former President Jimmy Carter, who said through a spokesman that he has not yet announced which candidate he will support at the party’s July convention in Philadelphia. Three other superdelegates from Georgia are either uncommitted or declined to comment on their choice.