Vice President Kamala Harris’s ascent to the top of the Democratic ticket has transformed the U.S. presidential race. But the real test awaits: Will the party be able to translate that energy into a winning coalition of voters in November?

Reid J. Epstein, who covers politics for The Times, discusses a group of skeptical voters in swing states who may post the biggest challenge to the vice president. Our audio producers — Jessica Cheung and Stella Tan — traveled to Wisconsin to speak to some of them.

Guest: Reid J. Epstein, a reporter covering politics for The New York Times.

Background reading:

How Ms. Harris’s running mate, Tim Walz, transformed from a little-known governor of a blue state to one of his party’s most prominent and powerful messengers.
Democrats are buzzing but sustaining the impetus is the next challenge.

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A Whole New Race