Those leading the campaign for voters to write in President Biden‘s name on New Hampshire’s primary ballot are warning about a robocall featuring a fake of Biden’s voice urging voters not to turn out for Tuesday’s primary.

It’s an example of how artificial intelligence (AI) can be used to mislead the public ahead of elections, and highlights the ways so-called deepfakes could become a nightmare for campaigns and elected leaders.

“This is deep fake disinformation designed to harm Joe Biden, suppress votes, and damage our democracy,” write-in campaign spokesperson Aaron Jacobs said in a statement.

Related: OpenAI bans developer of Dean Phillips bot, its first known political restriction

Four candidates in the March 5 top-two primary for California’s U.S. Senate seat debate tonight at 9 p.m. ET. Three House Democrats will be on stage along with Republican Steve Garvey, a former MLB player.

Rep. Adam Schiff (D) leads in most polls, with Garvey and Democratic Reps. Katie Porter and Barbara Lee vying for the second spot on the general election ballot. The Cook Political Report rates the general “solid Democrat.”

Some background on the Dems: Schiff led the first impeachment investigation into former President Trump. Lee was the only U.S. House member to vote against authorizing the war in Afghanistan in 2001. Porter has campaigned hard on refusing corporate PAC money.

Something to watch: The Democrats have taken different stances on the Israel-Hamas conflict, notes host outlet Politico, with Schiff generally supporting Israel’s actions, Porter calling for a conditional ceasefire and Lee calling for an unconditional ceasefire.  

Expect to hear more on that at the debate, hosted by Politico, Fox 11 Los Angeles and the University of Southern California Dornsife Center for the Political Future.

A recent Harvard CAPS-Harris poll showed a majority of voters, 59 percent, think President Biden “helped and participated in Hunter Biden’s business,” highlighting challenges for the president amid House GOP probes.

Whether the president was involved in his son’s business dealings while he served as vice president is a key question in the House GOP’s impeachment inquiry. The president has consistently denied any wrongdoing.

The poll also showed registered voters split 50-50 on whether former President Trump‘s “legal cases make it impossible for him to be a viable candidate for president.” Trump has pleaded not guilty to all charges against him.

More on the poll: Federal Jan. 6 conviction would hurt Trump most against Biden: Poll

“Today’s Republican Party desperately needs an Eisenhower”

“Step aside, Biden-Trump — this year’s veep race is the contest for the future”