Warren seems pretty done. Barring something extraordinary, it'll be difficult to imagine her making it to Super Tuesday. Pete and Joe represent different parts of the center. Joe has more of the Washington establishment and long time DNC folks with him while Pete has the consultariat and interest groups with a lot of yuppie energy behind him. Klobuchar seems to be drawing the remainder of middle aged institutional votes. Bernie's picking up a lot of working class support, unions, and old school lefties plus anti-establishment types and young people. Warren's kind of trying to draw from all of these groups but doesn't seem to have a firm foothold in any of them.