Ever present by the US president's side after his calamitous debate -- and foursquare behind him as he vowed to fight on in his reelection bid -- First Lady Jill Biden has been fighting her husband's battles from the front lines.
"I think she is as influential as pundits are claiming and her opinion likely matters more to him than anyone else's," said Tammy Vigil, a professor of communications at Boston University.
