Moderate 2020 Dems test if Biden stumbles provide opening

"As front-runners like Biden stumble ... it creates more opportunities for Michael in this race," said Craig Hughes, an adviser to Colorado Sen. Michael Bennet, one of the two dozen Democrats running for president.Biden is managing the fallout from a stinging attack launched on the debate stage this week by Kamala Harris.The critique seemed to catch Biden off guard, leaving him appearing defensive as he struggled for an appropriate response.