Amid the grow­ing momen­tum of Bernie Sanders’ pres­i­den­tial cam­paign, many pro­gres­sive advo­ca­cy groups appear reluc­tant to find out just how many of their mem­bers now sup­port Sanders.

MoveOn and DFA claim they will support the candidate who best represents the “Warren agenda.” Who precisely that candidate is, however, could be a hotly contested issue within the Democratic Party.

The team behind Ready for War­ren recent­ly launched a new ini­tia­tive, Ready to Fight, endors­ing Bernie Sanders’s pres­i­den­tial cam­paign. In a recent CNN op-ed, Ready for War­ren co-founders Eri­ca Sagrans (who is a board mem­ber of In These Times) and Charles Lench­n­er write that they polled their mem­bers and found that ​“56% of sup­port­ers have urged us to back Bernie Sanders as the can­di­date cur­rent­ly run­ning for pres­i­dent who best embod­ies the val­ues that War­ren champions.”

Oth­er pro­gres­sive groups had like­wise been com­mit­ted to a War­ren can­di­da­cy. In a Novem­ber 2014 mem­ber poll, Democ­ra­cy for Amer­i­ca (DFA) mem­bers over­whelm­ing picked Eliz­a­beth War­ren as the can­di­date they most want­ed to see run, with Bernie Sanders com­ing in sec­ond and Hillary Clin­ton third.

Warren’s strong per­for­mance prompt­ed Democ­ra­cy for Amer­i­ca to join MoveOn’s Run War­ren Run cam­paign. After War­ren announced that she would not run, MoveOn and DFA did not shift their sup­port to any oth­er sin­gle candidate.

But it’s dif­fi­cult to know whether the mem­bers of DFA and MoveOn have already coa­lesced around a sin­gle can­di­date. Democ­ra­cy for America’s last pub­lic mem­ber poll was in Novem­ber 2014 and the group has not com­mit­ted to pub­licly polling its mem­bers’ pref­er­ences in the 2016 pres­i­den­tial race.

Like­wise, in a pub­lic state­ment, MoveOn’s exec­u­tive direc­tor of polit­i­cal action Ilya Shey­man explains that the group will con­sid­er endorse­ments ​“if it appears MoveOn mem­bers might coa­lesce around a par­tic­u­lar can­di­date.” MoveOn did not respond to ques­tions about whether the pro­gres­sive advo­ca­cy group plans to con­duct a pub­lic poll of its mem­bers’ can­di­date preferences.

MoveOn and DFA do reg­u­lar­ly poll their mem­bers, and both claim they will sup­port the can­di­date who best rep­re­sents the ​“War­ren agen­da.” Who pre­cise­ly that can­di­date is, how­ev­er, is a hot­ly con­test­ed issue with­in the Demo­c­ra­t­ic Par­ty. MoveOn and DFA may be reluc­tant to com­mit to con­duct­ing a pub­lic mem­ber poll because the results could reveal a schism between the pro­gres­sive grass­roots and the Demo­c­ra­t­ic establishment.

While MoveOn and DFA remain unde­cid­ed, Sanders’ sup­port for a Medicare-for-all, sin­gle-pay­er health­care sys­tem, along with his pledge to break up banks that are too big to fail, led Ready for Warren’s mem­bers to endorse Sanders as the best advo­cate of the ​“War­ren Wing” of the Demo­c­ra­t­ic Par­ty. War­ren has joined in the enthu­si­asm her­self, telling the Boston Her­ald in a June 30 inter­view, ​“I love what Bernie is talk­ing about.”

Despite cur­rent uncer­tain­ties, the com­ing months will like­ly reveal which can­di­dates are com­mit­ted to the same pro­gres­sive eco­nom­ic agen­da as Eliz­a­beth War­ren. As Ready for Warren’s co-founders explain, ulti­mate­ly ​“the draft effort was nev­er just about her — it’s about her mes­sage and the val­ues she represents.”