John Fetterman’s popularity is sinking among Democratic voters in his backyard, according to an internal poll obtained by Blue Light News — one of the first major indications that the Pennsylvania senator is taking a hit with the very voters who elected him.

The poll is likely to take on new relevance as Democrats in Pennsylvania increasingly talk behind the scenes about the prospect of a primary challenge against Fetterman in 2028.

Fetterman, who lives just outside Pittsburgh, is underwater with likely Democratic voters in the city. Forty-nine percent said they have an unfavorable impression of him, while 46 percent said they have a favorable impression, according to the survey. By way of comparison, the poll showed 82 percent view Democratic Gov. Josh Shapiro favorably, versus 13 percent unfavorably.

The poll, completed by a Democratic firm surveying the upcoming mayoral primary election in Pittsburgh, was conducted before New York magazine published an article reporting that staff are concerned about Fetterman’s mental and physical health.

It is a single poll, and runs counter to recent public surveys. Still, it has shocked some Democrats in the state.

“In Pittsburgh, this is a break-glass, freak-out moment for Fetterman,” said a Pittsburgh-based Democratic strategist who was granted anonymity to speak frankly.

The results suggest a real vulnerability for Fetterman, who has made his personal ties to the region a key part of his political brand. During his 2022 Senate campaign, his team gave supporters yellow, Fetterman-branded towels modeled after the Pittsburgh Steelers’ “Terrible Towel.” Fetterman frequently uses the term “yinzer,” slang for a Pittsburgh native, and talks up his love of the convenience store Sheetz.

In the 2022 Senate primary, Fetterman overwhelmingly won Allegheny County, where Pittsburgh is located, by 25 percentage points, outpacing his rivals then-Rep. Conor Lamb and state lawmaker Malcolm Kenyatta.

The poll of 500 likely Democratic primary voters in Pittsburgh was conducted from Feb. 6 to Feb. 11, through a mix of phone calls and text-to-online responses.

The survey’s results are a marked contrast from public polling that has shown Democratic voters in Pennsylvania sticking by Fetterman even as many on the left criticize him over his positions on Israel and meeting with President Donald Trump.

Recent Morning Consult surveys have found Fetterman’s popularity rising in Pennsylvania, the result of him improving his numbers among Republican voters while keeping steady support with Democratic ones. Polls of adults across the country have painted a different picture, with him sliding among national Democrats and independents while performing better among Republicans.

Some Democratic strategists in Pennsylvania have said that Fetterman’s shifting approach to Trump could weaken the senator among Democratic voters more than his hardline stance on Israel. Fetterman has voted to confirm a number of Trump’s top officials, including Attorney General Pam Bondi. He said in January that he was meeting with Trump at Mar-a-Lago because he “will meet with and have a conversation with anyone if it helps me deliver for Pennsylvania and the nation.”

The internal survey found that Fetterman’s standing among progressives in Pittsburgh is in particular bottoming out. Seventy-four percent of self-identified progressive Democrats in the city gave him an unfavorable ranking, while only 22 percent gave him favorable marks. His approval rating was 52 percent favorable to 47 percent unfavorable among liberal Democrats and 65 percent favorable to 27 percent unfavorable among moderate and conservative Democrats.

Amid mounting questions about Fetterman’s health, some Democrats in the state have begun looking into the rules guiding what would happen if he stepped down and whispering about potential replacements. Fetterman has strongly denied that he is unfit to serve, called the New York article is “a one-source hit piece,” and has vowed to stay on through his term, which ends in 2029.