O'Rourke edges out Biden in MoveOn straw poll

Outgoing Rep. Beto O'RourkeBeto O'RourkeSteyer calls on DNC to expand polling criteria for debates Gabbard hits DNC over poll criteria for debates ABC unveils moderators for third Democratic debate MORE (D-Texas) narrowly leads former Vice President Joe BidenJoe BidenBiden evokes 1968, asks voters to imagine if Obama had been assassinated Biden blasts Trump's 'embarrassing' actions heading into G-7 summit Steyer calls on DNC to expand polling criteria for debates 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 SandersBernie SandersHickenlooper day-old Senate bid faces pushback from progressives Steyer calls on DNC to expand polling criteria for debates Andrew Yang: News coverage of Trump a 'microcosm' of issues facing country 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 TrumpDavid Axelrod after Ginsburg cancer treatment: Supreme Court vacancy could 'tear this country apart' EU says it will 'respond in kind' if US slaps tariffs on France Ginsburg again leaves Supreme Court with an uncertain future 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 CruzIs this any way for NASA to build a lunar lander? GOP strategist predicts Biden will win nomination, cites fundraising strength 3 real problems Republicans need to address to win in 2020 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 HarrisSteyer calls on DNC to expand polling criteria for debates Gabbard hits DNC over poll criteria for debates The Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch MORE (D-Calif.) — managed to get more than 10 percent support in the survey. Sen. Elizabeth WarrenElizabeth Ann WarrenSteyer calls on DNC to expand polling criteria for debates Gabbard hits DNC over poll criteria for debates The Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch 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 ClintonTrump takes aim at media after 'hereby' ordering US businesses out of China Trump knocks news of CNN hiring ex-FBI official McCabe Taylor Swift says Trump is 'gaslighting the American public' 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.