a person who overcomes a fall from grace or popularity; a person who makes an unlikely comeback
Al Gore is sometimes called the "Comeback Kid."
The most famous case of an incumbent President who had to play the comeback kid to win re-election was Harry Truman in 1948.
Bill Clinton, the "comeback kid," is back again—and stirring things up as only he can.
The redemption tour is over and Congress has a new comeback kid.