Bernie Sanders lost the momentum in the Democratic presidential race.
Sanders has little time to expand his base to defeat Biden in Michigan and the other March 10th states.
Biden won 10 out of 14 Super Tuesday states, putting Sanders back against the wall.
Biden now has the momentum and a virtually insurmountable polling lead, heading into March 10th.
Biden has appeal among blacks and suburban whites.
Sanders needs to desperately expand his coalition in order to stay competitive.