MoveOn.org officials announced Monday that they have garnered 110,000 signatures on a petition urging Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.) to run for president in 2016.

The announcement comes just one week after the progressive grassroots group launched a "Run Warren Run" campaign that included a $1 million investment.

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Warren has insisted that she will not run for president. And early polling has former Secretary of State Hillary Clinton with a huge lead against any Democratic challenger.

But the progressive group's calls for a Warren candidacy illustrate liberals' discomfort with a Clinton coronation, as well as their skepticism that Clinton is too close to Wall Street.

Warren is largely seen as a populist progressive who frequently supports more stringent banking regulations.