Biden Support Shrinks in Second Post-Debate Poll as Harris Rises

(Bloomberg) -- Joe Biden is barely clinging to front-runner status and Bernie Sanders has fallen sharply as Democratic voters give new attention to Kamala Harris and Elizabeth Warren after their strong debate performances.Biden remains at the head of the pack of Democratic presidential contenders -- though barely -- in a Quinnipiac University national poll released Tuesday. The former vice president had support from 22% followed by Harris with 20%, a result within the margin of error. Warren had