African-Americans have long made up a core of the Democratic voting base, but many of Mr. Biden’s college-educated, suburban supporters are right-leaning independents or moderate Republicans who supported candidates like John McCain and Mitt Romney. They don’t want to re-elect Donald Trump. And they’re willing to cross over to vote for a Democrat — a moderate and mainstream Democrat.
These voters might not identify with the “Never Trump” group of conservatives who vociferously oppose the president. But in practice, that’s who they are. They often voted for Republicans in the past and are now firmly anti-Trump. These voters can create winning margins for Democrats in swing states like Michigan, Pennsylvania, Arizona and North Carolina in the general election.
Their numerical strength was on full display on Super Tuesday in the Virginia and Texas suburbs, which saw 74 percent and 87 percent higher voter turnout, respectively, than four years ago.