Why Super Tuesday could leave Democrats even more unsettled as Biden tries to stop Sanders' momentum

On the eve of Super Tuesday, a confident Joe Biden glanced back to his landslide victory in South Carolina over the weekend and looked ahead to what he thinks will be a very good night. The former vice president told supporters in Houston that "we won in South Carolina, and we’ll win in Texas tomorrow.”

Texas is the second biggest prize on Super Tuesday – when a third of all Democratic presidential nomination delegates are up for grabs. Fourteen states from coast to coast hold primaries on a single day....