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Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonTrump: Cohen only became a ‘rat’ after FBI 'broke into' office Giuliani indicates Trump Tower Moscow discussions took place up until November 2016 Hillary Clinton writes letter to 8-year-old girl who lost class president to male classmate 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 Elizabeth GillibrandGillibrand says she's worried about top options in Dem 2020 poll being white men Biden team discussed 2020 run with O'Rourke as VP: report Senate Dems urge Trump to continue nuclear arms control negotiations after treaty suspension 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?"