A major Democratic fundraising bundler says party donors are holding off on contributions to any potential presidential contenders until rising star Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE decides whether he is running in 2020.

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"They’re not wanting to sign on to other presidential campaigns until they know whether Beto is going,” Mikal Watts told Politico. “And if Beto is running, what good progressive Democrat wouldn’t want to work for Beto O’Rourke?”

O'Rourke, a three-term congressman from Texas, lost his Senate campaign to incumbent Sen. Ted Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R-Texas) by 3 points earlier this month. The race was surprisingly heated and tight for deep-red Texas. He told TMZ on Friday that he has not made any decisions yet about running.

The Texas Democrat's campaign mobilized and excited voters across the country as millions tuned in to his social media-driven run. O'Rourke ultimately raised more than $70 million for his campaign, boasting an eye-popping $38 million haul in the third quarter.

“All the guy would have to do is send out an email to his fundraising base … and he raises $30 million,” a West Coast bundler told Politico. “It completely changes the game if Beto runs. And he should run … He’s Barack Obama Barack Hussein ObamaThe Memo: Trump's strengths complicate election picture Obama shares phone number to find out how Americans are planning to vote Democrats' troubling adventure in a 'Wonderland' without 'rule of law' MORE, but white."

The next Democratic presidential primary is expected to be crowded, but many say an obvious frontrunner has not yet emerged. Other possible contenders include Sens. Elizbeth Warren (D-Mass.), Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.), Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) and 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.).

“People across the country just fell in love with [O'Rourke],” Democratic strategist Christian Archer told Politico. “He was able to raise national-level money, and that’s just such a distinct advantage.”

“There’s a fuse on that, and the question is how long will that last if he doesn’t make a move within a window of time," Archer added.