An increasing number of prominent Democrats are growing skeptical of 80-year-old President Joe Biden's reelection chances in 2024, particularly following new polling data projecting him to lose to former President Donald Trump in several key states.

Biden and his campaign team have largely staved off significant public intraparty criticism and challenges, but as the elections grow closer and the president fails to improve in projections against Trump, some are sounding the alarm.

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David Axelrod, once the senior adviser to former President Barack Obama, called on Biden to make a decision on Sunday.

"If he continues to run, he will be the nominee of the Democratic Party. What he needs to decide is whether that is wise; whether it's in HIS best interest or the country's?" he asked, citing the New York Times/Siena College polling.

Another influential Democrat, Sen. Richard Blumenthal (D-CT), admitted Sunday that he had been concerned before the polling. “And I’m concerned now,” he added.

“These presidential races over the last couple of terms have been very tight,” he said. “No one is going to have a runaway election here. It’s going to take a lot of hard work, concentration, resources.”

Also on Sunday, former acting Democratic National Committee Chairwoman Donna Brazile reiterated her support for the president, saying, “Don’t count out Joe Biden.”

Despite her projected confidence, Brazile warned the data should be "a wake-up call once again for Democrats" and urged the campaign to work on coalition-building in swing states. “Without that coalition, it’s going to be a very, very difficult race," she said.

Before the recent polling, concerns had been building among Democrats. Last month, former New York Gov. Andrew Cuomo told Bill Maher, “I think there should be a Democratic primary.”

“I think the Democratic Party has to engage with real people and real voters on a different level," he said. "They’re too much: ‘Trump is no good and Trump is a bum.’ You can’t run on banking that the other guy is gonna lose."

Around the same time, veteran Democratic strategist James Carville foreshadowed the poor Biden numbers.

"I’m looking at polling data, and I’m looking at all of it," he said. "The president’s numbers are just not good — and they’re not getting any better."

"I talk to a lot of people who do a lot of congressional-level polling and state polling, and they’re all saying the same thing. There’s not an outlier; there’s not another opinion. … The question is, has the country made up its mind?" he asked.

And it's not only the elder statesmen in the Democratic Party who are starting to worry about Biden's chances next year. Younger voters are worried Biden is too old to run again, and their generation of political commentators and analysts are saying the same thing.

Jon Favreau, Obama's former speechwriter and podcast host, told the New York Times the president hasn't lived up to the expectations younger voters had for him in 2020.

"And then I think specific to Joe Biden, there are, of course, concerns about his age. I did a bunch of focus groups in 2022, and it’s not necessarily the criticism that you hear from Republicans, which is, like, he’s completely senile, and someone else is running the government, and he’s just a puppet and all that kind of stuff," Favreau said. "It’s more they thought when they elected Joe Biden the first time that he was going to be a bridge to the next generation, that even though he didn’t say it, that the implication was that he was going to serve one term. And now they think he’s getting up there in age, and they are a little uncomfortable about that."

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Not only is Biden slipping against a legally embattled Trump in swing states and falling behind with younger voters, but he's also seeing losses in support among black and Latino voters.

Despite these concerns, a significant Democratic challenger to the president hasn't emerged, and many of the rising stars in the party are active supporters of his campaign.