Warren announced her decision on a staff call Thursday morning.
She is dropping out despite earlier assertions that she would stay in the race until the Democratic National Convention.
It comes after warren had a very poor showing on Super Tuesday.
That disappointing performance was just the most recent loss in a downward trend.
Warren came in third in Iowa, fourth in New Hampshire and Nevada, and a distant fifth in South Carolina.
She had been competing with Sanders for the liberal vote and her departure cements his position as the main progressive candidate.
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