Have you ever noticed the tendency of Obama to go after enemies when they don't have the ability to respond.
Take the State of the Union, when he ripped the Supreme Court as they sat in the audience.
Or the ripping of Paul Ryan when he sat in the audience.
So when he has a chance to confront a challenger in the debate.... man to man.........he takes a pass.
But he seems to have plenty of balls the next day when the Rominator isn't there to call him out........