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Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonClintons, Stacey Abrams meeting Texas Democrats Biden says Russia spreading misinformation ahead of 2022 elections Highest-ranking GOP assemblyman in WI against another audit of 2020 vote MORE is largely seen as the prohibitive favorite for the party's nomination if she runs. Other lawmakers, including Vice President Biden, Maryland Gov. Martin O'Malley, Sen. Kirsten GillibrandKirsten GillibrandTreat broadband as infrastructure and we have a chance to get it right House panel looks to help military sexual assault survivors To make energy green, remove red tape MORE (D-N.Y.), and New York Gov. Andrew Cuomo (D), are also perceived as possible 2016 candidates.

Dean told the network that Clinton would not have "a pass" if she decided to run, despite early polls showing her with substantial leads over other Democrats.

"There will be other people who will run," Dean said.

But Dean, whose 2004 presidential campaign derailed after a disappointing third-place finish in the Iowa caucuses his often-mocked yell, sometimes called the "Dean Scream", said he was leaning against a run at the moment.

"If you had to put a gun to my head and make me decide right now, I wouldn't," he said. "But who knows?"