Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE doubled down on his argument that he’s the most electable challenger to President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE, citing polling showing him beating the president in 2020.

Biden sent a fundraising email to supporters citing a New York Times-Siena College poll released Monday showing him ahead in a hypothetical 2020 match-up with Trump in key swing states while Sens. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) and Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) trail the president in the same states.

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"This speaks for itself," Biden’s campaign said. "If Joe Biden wins the primary, he can beat Trump in a general election. Other candidates can’t."

The campaign included a graphic showing Biden beating Trump in Michigan, Pennsylvania, Wisconsin, Florida and Arizona. The graphic also shows Sanders trailing in all of those states except Pennsylvania, where he pulls even, and Warren losing in all of those states except Arizona, where she ties the president.

In the Times-Siena College poll, however, Sanders actually leads Trump by 3 points in Michigan, ties him in Wisconsin and narrowly trails him in Pennsylvania. The graphic also leaves off North Carolina, a state where Trump leads all three Democrats in the poll.

Electability has remained at the heart of Biden’s appeal, with the former vice president often saying he is the only candidate who can unseat Trump and that he would beat the president “like a drum.”

However, several other polls show that Warren and Sanders, who round out the top three in most surveys, could be competitive in 2020.

An ABC News-Washington Post poll released Tuesday found that Biden and Sanders lead Trump by 17 percentage points, while Warren leads him by 15 points. Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE both lead Trump by 11 points in the survey.

The fundraising request comes amid Democratic hand-wringing over the Biden campaign's finances. While it reported a $15.2 million haul in the third quarter of 2019, that total fell millions of dollars short of the third-quarter hauls of Warren and Sanders.

The former vice president also finished the third quarter with just under $9 million cash on hand, while Sanders, Warren, Buttigieg and Harris had $33.7 million, $25.7 million, $23.4 million and $10.5 million, respectively.

The fundraising concerns coincided with a slip in the polls, though the former vice president still leads in many surveys and has an 8.5-point edge in the RealClearPolitics polling index.

"Folks, we’ve been honest with you about this from the beginning," the Biden campaign said. "We told you Bernie Sanders and Elizabeth Warren both have double the money we have to spend on winning the Democratic primary."

"The decisions we make now decide the next six years of our country," it continued. "Thanks for being on the team that can get Donald Trump out of office.”