Responding to criticism from Hillary ClintonHillary Rodham ClintonAssange meets U.S. congressman, vows to prove Russia did not leak him documents High-ranking FBI official leaves Russia probe OPINION | Steve Bannon is Trump's indispensable man — don't sacrifice him to the critics MORE that he has been too critical of President Obama, Bernie SandersBernard (Bernie) SandersThe media couldn't be more blatant in distorting Trump's words on Charlottesville Road to renewable energy is filled with potholes of ‘magic thinking’ Bernie Sanders: Trump’s Charlottesville comments ‘embarrassing’ MORE on Thursday night noted she once faced off with him in a presidential race.

"One of us ran against Barack ObamaBarack ObamaCongress needs to assert the war power against a dangerous president CNN's Don Lemon: Anyone supporting Trump ‘complicit' in racism DOJ warrant of Trump resistance site triggers alarm 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.