The GOP outreach also comes at a potentially important moment. Latino and African-American voters overall have real issues with Mr. Trump. In 2016 he scored only 8% of the black vote, 28% of Hispanics, and 27% of Asian-Americans. Yet the polls also show a growing awareness and frustration among minorities that the Obama-Biden years didn’t deliver for their communities. Despite his putative lead nationally, Mr. Biden has less black and Hispanic support at this point in the race than Hillary Clinton and Barack Obama did.

Does that softness translate into a giant Trump minority pickup? No. But it doesn’t have to. Democrats like to point out that Mr. Trump won the election by a margin of 80,000 votes across three swing states. The Trump campaign knows that increasing its support—even a little—among minority communities in those and other key battlegrounds could prove huge. Take Michigan, one of the three, where Mr. Trump won an estimated 6% of the African-American vote in 2016. A recent Trafalgar poll showed his current support at nearly double that, which would translate into tens of thousands of votes. Recent polls have also shown Mr. Trump doing better with Latinos, with one Marist poll showing him up 11% over 2016. Consider what that might mean in Arizona or Florida.