Warren teases supporters with ‘I’m in’ email
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Warren sent the email to raise money for the Democratic Senatorial Campaign Committee.
But the teasing subject line comes as progressives are trying to draft her as a 2016 presidential candidate, despite her insistence that she's not running.
"The question is whether enough Democrats will stand up -- stand up to corporate money and powerful interests and stand up for regular people, working families, and progressive values," Warren wrote in the DSCC email. "I’m in — what about you? Will you donate by midnight to take back the Senate?"
Liberal groups such as Democracy For America (DFA) and MoveOn.org are trying to draft Warren into challenging likely 2016 Democratic presidential candidate Hillary Clinton. They have voiced concerns that Clinton is too closely aligned with Wall Street.
DFA spokesman Neil Sroka said Warren's fundraising email will fuel liberals' hopes that she'll run in 2016.
"That excited gasp you heard earlier this morning was from the hundreds of thousands of activists across the country who are looking forward to hearing her say those same words on a snowy morning in Concord or Des Moines," Sroka told The Hill.
Warren said in Spingfield, Mass., earlier this month that she thinks her supporters are trying to draft her to run for president because "they're ready to fight back."
Earlier this week on MSNBC, she refused to tell host Al Sharpton whether she thought Clinton was a "progressive warrior."
"We'll have to wait and see," Warren said. 
“Sen. Warren's recent comments show she understands why a growing number of supporters want a progressive warrior like her to run for president in 2016," said Erica Sagrans, campaign manager for Ready for Warren.
"If the party that rigged the system in favor of the rich and powerful takes over the White House, much of Warren’s great work could be undone," Sagrans said.