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Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonWhat did Peter Strzok do? The strategic blunder of ‘Trump-as-Hitler’ Races to watch in Tuesday’s primaries 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 GillibrandOvernight Defense: Defense spending bill amendments target hot-button issues | Space Force already facing hurdles | Senators voice 'deep' concerns at using military lawyers on immigration cases Senators 'deeply troubled' military lawyers being used for immigration cases Senate moving ahead with border bill, despite Trump 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?"