There are not a lot of voters heading into the midterms focused mainly on health care, but the ones who are, are Democrats. That is the undeniable thrust of the Kaiser Family Foundation's latest tracking poll.

By the numbers: Overall, just 20% of the people Kaiser surveyed said health care is the most important issue in the midterms — but a sizable majority of those people are Democrats.

Yes, but: Policy is not the main thing driving Democrats this cycle. A plurality (30%) said they would vote primarily based on candidates' support or opposition to President Trump.

The bottom line: This poll seems to validate the conventional wisdom: After several years in which health care — namely, opposition to the Affordable Care Act — was motivating Republican turnout, health care is now back to its historical status as an issue that animates the left more than the right.

• Kaiser's various questions about voters' motivations also seem consistent: Democrats are energized because they oppose Trump, and health care repeal is part of the reason why.