O'Rourke edges out Biden in MoveOn straw poll

Outgoing Rep. Beto O'RourkeRobert (Beto) Francis O'RourkeHere's what the Dem candidates for president said about the Mueller report Booker takes early lead in 2020 endorsements Harris wants Barr to testify on Mueller report as 2020 Dems call for its release MORE (D-Texas) narrowly leads former Vice President Joe BidenJoseph (Joe) Robinette BidenBooker takes early lead in 2020 endorsements Former Georgia candidate asks Abrams be given 'space' amid 2020 buzz Biden team denies 'pre-cooked plan' of Abrams as early running-mate pick MORE as a potential 2020 contender among members of the progressive group MoveOn.org. 

A straw poll released by the group on Tuesday put O'Rourke ahead of Biden by little more than half a percentage point — 15.6 percent to 14.95 percent. Sen. Bernie SandersBernard (Bernie) SandersHere's what the Dem candidates for president said about the Mueller report Booker takes early lead in 2020 endorsements Harris wants Barr to testify on Mueller report as 2020 Dems call for its release MORE (I-Vt.) comes in after that at 13.15 percent.

A plurality of members surveyed — 17.89 percent — said they either didn't know who they would choose in 2020 or that they preferred "someone else," the survey found.

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The straw poll results listed 33 potential Democratic hopefuls, although one of the would-be candidates on the survey, former Massachusetts Gov. Deval Patrick, has said he will not seek the party's presidential nomination in 2020. 

The results bolster O'Rourke's growing clout in the field of would-be Democratic challengers to President TrumpDonald John TrumpMueller report findings could be a 'good day' for Trump, Dem senator says Trump officials heading to China for trade talks next week Showdown looms over Mueller report MORE, especially among progressive and liberal voters, who are seen as crucial to winning the party's nomination. 

The soon-to-be-former Texas representative emerged as a sort of rock star in Democratic politics this year as he mounted a high-profile — though ultimately unsuccessful — Senate bid against Sen. Ted CruzRafael (Ted) Edward CruzCNN town halls put network at center of Dem primary The Memo: Trump can't let go of McCain grudge Michael Bennet is close to deciding on possible presidential bid MORE (R-Texas). 

While he threw cold water on the possibility of a White House run earlier this year, O'Rourke has since opened the door to a bid, saying late last month that he and his wife would not "rule anything out."

While O'Rourke narrowly leads the field of potential Democratic contenders listed in the straw poll, MoveOn's members appear to be splintered in their support.

Only four possible candidates — O'Rourke, Biden, Sanders and Sen. Kamala HarrisKamala Devi HarrisKamala Harris to pitch using federal funds to give teachers pay raises Dem senator: 'Appropriate' for Barr, Mueller to testify publicly about Russia probe Here's what the Dem candidates for president said about the Mueller report MORE (D-Calif.) — managed to get more than 10 percent support in the survey. Sen. Elizabeth WarrenElizabeth Ann WarrenHere's what the Dem candidates for president said about the Mueller report Booker takes early lead in 2020 endorsements Harris wants Barr to testify on Mueller report as 2020 Dems call for its release MORE (D-Mass.), who is already building up her operation for a potential 2020 bid, came in fifth place, after Harris, with 6.42 percent support.

MoveOn endorsed Sanders in 2016 after he garnered the support of 78 percent of voters in the group's straw poll to beat out Hillary ClintonHillary Diane Rodham ClintonIf Mueller's report lacks indictments, collusion is a delusion Conservatives wage assault on Mueller report The wisdom of Trump's lawyers, and the accountability that must follow Mueller's report MORE, the eventual Democratic nominee.

But unlike in 2016, the Democratic field is expected to be far more crowded this year, with around three dozen potential candidates rumored to be weighing presidential bids.

MoveOn isn't yet endorsing a potential presidential candidate. That won't come until later, when the group holds a formal vote by its members, the group said in an email. 

MoveOn's latest straw poll offered some clues about what progressive voters may be looking for in their next presidential candidate.

More than 63 percent of respondents said they want candidates "who inspire the public with deep progressive values and will move us toward a more progressive future where everyone can thrive," the group said. 

Another 54 percent said they are looking for candidates "who make the connections between racial, social, and economic injustice and commit to platform positions to see these connections through," according to MoveOn.