Grass-roots efforts to cultivate an Elizabeth Warren presidential run appear to be withering on the vine as the 2016 Democratic primary firms up, with Hillary Clinton and Bernie Sanders in the race, and erstwhile Warren activists abandoning their labor of love.

“Whether they are slowing down or not, their momentum is slowing,” said Steve McMahon, a Democratic strategist in Washington, D.C., who hasn’t committed to a presidential candidate.

“It’s one thing to support a hypothetical candidate before Hillary gets in, and it’s one thing to support an opponent to Hillary before Bernie gets in,” McMahon said. “But a lot of progressives who like Warren, at this point support Hillary and want her to win and don’t want her to be hurt in a contentious primary.”

Jim Demers, a prominent New Hampshire Democratic strategist who’s backing Clinton, said the Granite State push to draft U.S. Sen. Warren has been missing in action recently.

“It seems like it has lost a lot of attention, at least in New Hampshire. I haven’t seen the organizer out in a couple of weeks,” Demers said, adding that Clinton may be winning over the Warren crowd with recent moves like embracing one hot-button issue that ?Warren backers wanted on the agenda — immigration.

“We’re already starting to see some of the issues they were hoping would be in the campaign,” he said.

Hard-line progressive groups like Democracy for America and MoveOn are behind the Warren-for-president movement, but Warren’s repeated refusals to run combined with progressive darling U.S. Sen. Bernie Sanders’ entrance into the race has impacted their campaign.

But those behind the Ready For Warren and Run Warren Run organizations aren’t ready to give up. One key strategist behind the Ready for Warren push said the group plans to release another round of big-name former President Obama supporters who are asking Warren to jump into the 2016 campaign.

“If anything, we’re stronger now that not just Hillary but Bernie are in the race,” said the strategist, who asked to remain on background.

There’s already evidence of some defectors, however. Artists for Warren recently endorsed Sanders and Carl Gibson, a progressive activist, journalist and former Warren-for-president supporter, wrote a column recently urging the movement to get behind Sanders.

“The quicker her fans stop waiting in vain, the better chance Sanders will have to fight for the values voters associate with Warren,” Gibson wrote.