Responding to criticism from Hillary ClintonHillary Rodham ClintonCNN to air 'The Russian Connection: Inside the Attack on Democracy' Tuesday night Did Democrats really have Georgia on their minds? Changing America: America’s growing education divide MORE that he has been too critical of President Obama, Bernie SandersBernie SandersOPINION: Destroy McConnellCare, RyanCare and TrumpCare travesties Dems face identity crisis Sanders: GOP healthcare bill 'barbaric and immoral' MORE on Thursday night noted she once faced off with him in a presidential race.

"One of us ran against Barack ObamaBarack ObamaDems face identity crisis Inspector general report: Park Service did not change records of crowd size at inauguration Feehery: Medicaid reform opening MORE,” he said at the Democratic primary debate in Wisconsin. “I was not that candidate."

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Sanders, a senator from Vermont, made the remark after Clinton called him out for criticizing Obama and saying he "failed the presidential leadership test."

"Calling the president weak, calling him a disappointment, calling several times that he should have a primary opponent when he ran for reelection in 2012," she said, "I think that goes further than saying 'we have our disagreements."'  

Clinton said that while she understands there are policy disagreements, the "personal assessments and charges" Sanders made were "particularly troubling." 

Sanders defended himself earlier in the debate, saying he had worked with Obama, and that a U.S. senator has the right to disagree with the president.

Updated at 11:21 p.m.