(CNN) Americans are as divided as congressional Democrats about how to expand health care coverage to more people.

Coming off their midterm election romp, progressive Democrats feel they have a mandate to push for a universal "Medicare-for-all" plan. But some of their Democratic peers support less drastic changes to the nation's health care system.

A national Medicare-for-all plan received the lowest favorability score in Kaiser Family Foundation's January tracking poll , released Wednesday. Some 56% of respondents said they favor Medicare-for-all, in which all Americans would get their insurance from a single government plan.

But roughly three-quarters of Americans prefer other proposals to expand Medicare or Medicaid, Kaiser found. Some 77% favor allowing people age 50 to 64 to buy into Medicare, while 75% would allow people who don't have job-based insurance to buy into Medicaid, the government health insurance program for low-income Americans.

Some 74% favor creating a national health insurance program similar to Medicare, but allowing people to keep the coverage they currently have, according to Kaiser.

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