Former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE is almost certain to enter the 2020 presidential race, according to sources familiar with his plans.

“It’s pretty clear he’s jumping in,” said one source with direct knowledge of the would-be campaign’s moves, adding that Biden is “95 percent there.”

In recent days, Biden has sought to build support from grass-roots activists and is specifically asking donors for their help in the lead-up to an announcement, according to sources.

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In phone conversations, Biden has been making the case for why he’d be the best candidate in what is already a crowded field.

“Here are the facts: He’s coming off a great midterm,” said Robert Wolf, the Democratic mega-donor who confirmed he spoke to Biden on a 25-minute call on Wednesday.

“He has been the most popular surrogate during the midterms and one of the only surrogates that can play in all 50 states, and that has given him a lot of confidence that he can do well in a national election," Wolf said.

“He can campaign everywhere and that’s certainly what many people would say is an incredible strength for him.”

Biden has led a number of polls surveying Democratic voters on their preferences for the 2020 race, results that could point to the former vice president’s high name ID but that also underscore support for his candidacy.

In a Monmouth University poll released on Feb. 4, Biden won 29 percent support compared to 16 percent for Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), who also has not decided on whether to run for the White House.

Candidates who have jumped into the race trailed both Biden and Sanders: Sen. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) won 11 percent support while Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) took 8 percent.

Former Rep. Beto O’Rourke (D-Texas), who is also thinking about entering the race, took 7 percent.

Biden had a favorable rating of 80 percent among those surveyed, compared to just 9 percent who had an unfavorable view of him.

A Morning Consult/Politico poll released at about the same time found Biden with 33 percent support, compared to 15 percent support for Sanders and 10 percent support for Harris.

With more and more candidates getting into the race, Biden’s popularity with Democratic voters and early success in polls could be a boon to his candidacy.

In addition to Warren and Harris, a number of other well-known political figures have jumped into the race, including Sens. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) and Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.), in addition to former Housing and Urban Development Secretary Julián Castro and Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii).

O’Rourke is expected to jump into the race, and Sanders and Sen. Sherrod Brown Sherrod Campbell BrownSenate Democrats release report alleging Trump admin undermined fair housing policies Bipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda MORE (D-Ohio) are both openly considering candidacies, as is former New York City Mayor Michael Bloomberg.

With that crowded a field, the potential for candidates to split up the vote — to the benefit of Biden — would seem to increase.

Wolf said he came away from his phone call with Biden with the feeling that the former vice president is “90 percent” running.

“He feels incredibly excited to enter the race,” Wolf said. “He feels he would be the best candidate and he's ready to go for it. That's what it felt like to me.”

The Washington Post reported Thursday that Biden has lost some potential campaign aides with his indecision about getting into the race. The story was headlined: “Joe Biden’s 2020 campaign decision: Quietly agonizing as months go by.”

But sources close to Biden say he has been taking his time on making a decision and doesn’t feel the need to get out there quickly because he already has the name recognition needed to run.

The former vice president initially said he would reach a decision by the end of the year and has since said that a decision would come soon.

“I don’t want to make this a fool’s errand,” he said at an event in Florida last month to applause from the crowd.

He said he was “running the traps” on a decision to enter the race. “I’m a lot closer than I was before Christmas, and we’ll make a decision soon,” Biden added.

In a tweet on Thursday, Wolf firmly pushed back on the Post story.

“Sorry but I spoke with @JoeBiden yesterday and 'agonizing' is just way off the mark - you could feel his enthusiasm and excitement throughout the conversation,” Wolf tweeted.

Even Biden’s staunchest allies acknowledge he will have a tough time winning the primary, despite the polls showing enthusiasm for his candidacy.

The party has moved increasingly to the left, and while Biden would have a decent shot at defeating President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE in a general election, they point out that he would have a difficult time in a primary where he is perceived as being more of a centrist.

Democrats have also said they want a fresh face to run the party after 2016 nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE’s stunning election defeat, and some worry he would have the same problems Clinton had in the general election.

Biden, 76, is an older white male at a time when some Democrats are looking for fresh faces and would like a woman or minority candidate to take on Trump.

At the same time, many Democrats see Biden as the strongest general election candidate against Trump — and someone who can take back the Rust Belt states that Trump won over Democrats in 2016.

And in an election where Democrats are desperate to make Trump's a one-term presidency, the ability to win is a big calling card for Biden and his supporters.