HAVE YOU SEEN THESE VOTERS? The Missing Obama Millions.

Our analysis shows that while 9 percent of Obama 2012 voters went for Mr. Trump in 2016, 7 percent — that’s more than four million missing voters — stayed home. Three percent voted for a third-party candidate.

We would hardly urge Democratic strategists to abandon Obama-to-Trump voters. However, Obama-to-nonvoters are a relatively liberal segment of the country who have largely been ignored. They are mostly young and nonwhite, and they represent an important part of the Democratic Party’s demographic future. Given the likelihood that many Obama-to-Trump voters will remain in Republican ranks, it is hard to imagine how Democrats can win elections if this group remains on the sidelines.

This is why every serious (and not-so-serious) Democratic contender for 2020 has already doubled down on the identity politics.