Warren silent on Clinton candidacy
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Sen. Elizabeth WarrenElizabeth Ann WarrenTrump preps conspiracy theory to explain faltering economy Sanders, Warren back major shift to fight drug overdoses Rendell: Biden 'baked in' as Democratic nominee MORE (D-Mass.) made no mention of Hillary ClintonHillary Diane Rodham ClintonTrump preps conspiracy theory to explain faltering economy The ideological divide on vaping has a clear winner: Smokers Biden struggles to hit it off with millennials MORE's newly-announced 2016 campaign during an economic speech on Monday, as she was greeted by a capacity-crowd that held "Run Warren Run" signs.

Warren urged labor groups and progressives to continue fighting against what she said was a Republican effort to deregulate the economy during her speech at the Good Jobs, Green Jobs forum.

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"The rich and the powerful have rigged the game," Warren told the audience of 500 people. "They fight for an America that works for them and leaves everyone else behind."

The "Run Warren Run" signs were printed by MoveOn.org, which has been pressing for Warren to enter the 2016 race despite her refusals.

Warren advocated for more "smart regulations [that] give people information so they can make their own decisions."

Progressives have urged Warren to enter the race to challenge the former secretary of State, who formally announced her candidacy on Sunday. Warren has said repeatedly she is not running.