I hate that there are people uninformed enough to believe these were legitimate calls, but I'm sure at least some of them were fooled. Via the New York Times:

Voters in New Hampshire received robocall messages over the weekend in a voice that was most likely artificially generated to impersonate President Biden’s, urging them not to vote in Tuesday’s primary election, according to the state attorney general’s office.

The fake recordings, which told listeners that “your vote makes a difference in November, not this Tuesday,” were manipulated to seem as if they had been sent by an officer of a Democratic committee, the office said.

The attorney general’s office stressed that voting in the primary would not rule out voters from also casting ballots in the general election in November.

“These messages appear to be an unlawful attempt to disrupt the New Hampshire presidential primary election and to suppress New Hampshire voters,” the office said in a statement. “New Hampshire voters should disregard the content of this message entirely.”

The calls were spoofed to appear they were coming from the personal cell phone of Kathy Sullivan, the ex-NH Democratic chair.