Bernie Sanders slams Hillary Clinton: 'You cannot be a moderate and a progressive'

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Bernie Sanders didn't name any names when he unleashed on Twitter Wednesday, but there was little question that his target was Democratic rival Hillary Clinton. In a series of tweets ranging from "most of the progressives I know were against the war in Iraq" to "most progressives that I know don't raise millions of dollars from Wall Street," Sanders seemed to question just how progressive Clinton really is:

Sanders' increasingly combative rhetoric comes as the competition between him and Clinton heats up. Clinton eked out a razor-thin victory in the Iowa caucuses, with 49.9 percent support to Sanders' 49.6 percent.