Why rising diversity might not help Democrats as much as they hope

And yet it is hard to find a single state where the increasing racial diversity of the electorate, even over an exceptionally long 30- or 40-year period, has been both necessary and sufficient for Democrats to flip a state from red to blue. Even in states where Democrats have needed demographic changes to win, like Georgia and Arizona, the party has also needed significant improvement among white voters to get over the top. One reason demographic change has failed to transform electoral politics is that the increased diversity of the electorate has come not mainly from Black voters but from Hispanic, Asian-American and multiracial voters. Those groups back Democrats, but not always by overwhelmingly large margins. In 2020, Democrats probably won around 60 to 65 percent of voters across these demographic groups. These are substantial margins, but they are small enough that even decades of demographic shifts wind up costing the Republicans only a couple of percentage points.