Sanders supports a Medicare-for-all type plan that would provide universal coverage, though he has released only a sketchy outline of his proposal. He says he would fund it by raising taxes.
Clinton favors improving the Affordable Care Act with measures to reduce cost-sharing and make drugs more affordable. She says Sanders' plan isn't affordable or politically feasible. She has alienated some liberal Democrats for rejecting their preferred single-payer approach.
Clinton and Sanders are about even in most Iowa polls, while Sanders is ahead in New Hampshire, which will hold its primary on Feb. 9. Clinton tops Sanders in national polls.