As recently as this summer, a poll with Donald J. Trump leading among young voters would have been eye-popping.

Now, it’s increasingly familiar — and our new New York Times/Siena College national survey released Tuesday morning is no exception.

For the first time, Mr. Trump leads President Biden among young voters in a Times/Siena national survey, 49 percent to 43 percent. It’s enough to give him a narrow 46-44 lead among registered voters overall.