For the first time in a New York Times/Siena College national survey, released this month, Democrats had a larger share of support among white college graduates than among nonwhite voters. And a survey, conducted this month for the AARP by a bipartisan polling team of Fabrizio Ward and Impact Research, found that in congressional battleground districts, Democrats were underperforming with Black, Hispanic and Asian American voters over age 50 compared with past elections — with especially worrisome signs for Democrats among the latter two constituencies.

Among Hispanic and Asian American voters over 50, Democrats were ahead on the generic congressional ballot by just five and three percentage points, with Democrats doing notably better with Hispanic and Asian American college graduates than with those who did not have a four-year college degree, the survey found.

In the 2018 midterms, Democrats won 69 percent of Latino voters and 77 percent of Asian American voters overall, according to exit polls. That data is not an apples-to-apples comparison, but it does suggest significant shifts among diverse groups of voters that Democrats have hoped to cement as part of their base.