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Former Secretary of State Hillary ClintonHillary Rodham ClintonTrump and Sessions no longer speaking to one another: report Top aides urging Trump to stop public criticism of Sessions: report Poll: Nearly three-quarters of US Muslims view Trump as unfriendly to them 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 GillibrandJimmy Carter predicts US will eventually have single-payer healthcare system Trump's DOJ gears up for crackdown on marijuana OPINION | Hey Dems, Russia won't define 2018, so why not fix your party's problems instead? 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?"