Offering a judicious piece of advice to Sen. Hillary Clinton, the former U.S. President, Jimmy Carter said on Sunday that Clinton should quit her race for Democratic presidential nomination by early June.

According to Carter, most Democratic Party leaders known as superdelegates will have announced whether they support Clinton or her Democratic opponent Barack Obama soon after the last round of primaries finishes early next month.

Carter is one of 200 or so uncommitted superdelegates, but he suggested the outcome of the race was already crystal clear. He said, "I'm a superdelegate, having been president before, and I think that a lot of us superdelegates will make a decision ... quite rapidly, after the final primary on June 3. I think at that point it will be time for her to give it up."

Clinton and Obama need 2,026 delegates to secure their party's presidential nomination. Obama currently has a total of 1,974 delegates, giving him an almost insuperable lead over Clinton, who has 1,779.