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Sanders: 'Madame secretary, that is a low blow'

Hillary Clinton laced into Bernie Sanders for his remarks earlier Thursday in which he questioned the leadership of President Barack Obama.

“I don’t think he gets the credit he deserves," Clinton said, speaking Obama's accomplishments and noting Sanders' past criticism of Obama in a book blurb and in other instances. "The kind of criticism that we've heard from Senator Sanders about our president I expect from Republicans, I do not expect from someone running for the Democratic nomination to succeed President Obama."

Sanders exclaimed, "Madame secretary, that is a low blow."

Noting "unprecedented Republican obstructionism," Sanders said, there has been "enormous progress."

"Last I heard, we lived in a democratic society. Last I heard, a United States senator had a right to disagree with a president, especially a president who has done such an extraordinary job," he added.

Sanders saved his most cutting remark for last.

"One of us ran against Barack Obama," he concluded. "I was not that candidate."

In his earlier interview with MSNBC aired Thursday, Sanders remarked that there is "a huge gap right now between Congress and the American people. ... What presidential leadership is about [is] closing that gap.”