New polls by The New York Times and Siena College find that Vice President Kamala Harris has transformed the 2024 presidential race and is now leading former President Donald J. Trump in three crucial battleground states.

Nate Cohn, the chief political analyst for The Times, explains why Ms. Harris is benefiting so much.

Guest: Nate Cohn, the chief political analyst for The New York Times.

Background reading:

Ms. Harris leads Mr. Trump in three key states, according to new surveys by The Times and Siena College
The polls show that the vice president has fundamentally changed the race.

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