Where Harris Has Gained and Lost Support Compared With Biden

When Kamala Harris became her party’s nominee, she inherited a Democratic coalition in shambles.

As she wraps up her party’s convention one month later, she’s well on her way toward stitching it back together.

In this month’s New York Times/Siena College battleground polls, she led Donald J. Trump by two percentage points across the seven states likeliest to decide the presidency, compared with Mr. Trump’s five-point lead in May.

It’s an enormous shift, but Vice President Harris didn’t improve equally among all demographic groups. Instead, she made big gains among young, nonwhite and female voters, and made relatively few or no gains among older voters and white men.

If you drew up a list of President Biden’s challenges this cycle, you could probably find a demographic group corresponding to each one on this list of Ms. Harris’s biggest gains.

There’s young, nonwhite and low-turnout voters, and the places they tend to live. There’s the lowest-income voters, who suffered through rising prices. There’s even the TikTok users immersed in the bad vibes of the Biden era. The Muslim and Arab voters angry about the war in Gaza don’t make the list, but only because of their small sample size (just 55 respondents in August) — they would have been No. 1 on the list with a net swing of 49 points toward Ms. Harris.