U.S. Voters Support Expanding Medicare but Not Eliminating Private Health Insurance

Democratic presidential candidates are presenting policy ideas that are broadly popular with Americans, including tuition-free state colleges, but other proposals—such as Medicare for All—could complicate the party’s prospects next year, the latest Wall Street Journal/NBC News poll shows.

Two-thirds of registered voters support letting anyone buy into Medicare, similar to an idea that former Vice President Joe Biden and some other Democratic candidates have proposed. Two-thirds say that young adults brought to the U.S. illegally should be allowed to stay, an idea broadly supported by the party’s presidential field. Nearly...