Trump would need to sway broader group of voters in November

To counter the Democrats' advantage among women, young people and black, Latino and Asian-American voters, Trump will have to maximize his support among whites — especially white men — to levels rarely seen.

Ruy Texeira of the liberal Center for American Progress noted that Trump has performed well in the primaries among white college graduates, but polls indicate the businessman is disliked by that demographic in the broader electorate.

"The guy is hated and detested by an extraordinary amount of the American electorate," said Whit Ayres, a GOP pollster who worked on Florida Sen. Marco Rubio's presidential campaign.

Polls find voters don't trust her, and she's had to fight harder than expected against Vermont Sen. Bernie Sanders, who beat her in Indiana and has locked down the fast-growing youth vote.

Ohio Republican Chairman Matt Borges, who still backs his governor, John Kasich, for the nomination, insists Clinton's unpopularity will bridge any GOP gaps.

Democrats outnumber Republicans in New York by a 2-1 margin and have carried the state in the past seven presidential elections.

Bowman said Trump's New York claim "seems completely ridiculous," though she and others allow that he could make inroads among Democrats, particularly if black voters are less enthusiastic about Clinton than they were for Barack Obama.