Biden says will 'stand firm' against an Obamacare overhaul

"Senator Sanders is a good man. His Medicare for All push would be a long and expensive slog if he can get done at all," said Biden at Michigan's Cherry Hill Health Center.

Sanders has made a government-run healthcare system, Medicare for All, the heart of his campaign.

Sanders goes into Michigan badly in need of a win after former Vice President Biden seized control of the race on Super Tuesday last week, winning a bevy of Southern states as well as Massachusetts, Minnesota and Texas and causing rivals Elizabeth Warren and Michael Bloomberg to drop out.