If Warren isn’t going to be a candidate, liberals hope she can at least be a player behind the scenes. That way, they might indirectly influence Clinton as she seeks a full-throated endorsement from Warren. To that end, liberals are doing everything possible to ensure that the public conversation—in newspapers’ op-ed pages, and at every political forum, debate, and town hall meeting—centers on Warren’s brand of economic populism. “We view an election as a multi-billion dollar conversation with voters,” said Adam Green, a co-founder of the Progressive Change Campaign Committee. “The more that conversation is about progressive issues, the better.”

Making that happen will involve enlisting progressive leaders both in the all-important early caucus and primary states and nationally. On Tuesday, the PCCC launched a new campaign, Ready for Boldness, along with a signed letter from 200 leaders from Iowa and New Hampshire designed to urge presidential candidates to “campaign on big, bold, economic populist ideas.” Signers included Iowa’s longtime Sen. Tom Harkin, union presidents and state legislators. “We want to show [Clinton] that it she embraces big bold progressive ideas, she won’t be alone,” Green said.