Is Elizabeth Warren a Democrat or Republican?

Elizabeth Warren spent nearly two decades as a Harvard Law professor and consumer advocate.
Now she is involved in politics and is starting her 2011 campaign for the Senate. Is Elizabeth Warren a democrat or a republican? Is she a socialist?
Elizabeth Warren promised to battle corporate abuses and rebuild United States’s beleaguered middle class.
What are her thought's on the current Obama presidency?

Elizabeth Warren is a democrat. She debuts in the Massachusetts Senate race as the first candidate PPP has found with a lead against Senator Scott Brown.
Elizabeth Warren may be the dream candidate for Democrats. Fueling her rise is a passionate speech that has caught fire on the Internet.
Now republicans are demanding that Harvard University stop paying Elizabeth Warren her salary for doing her job as a professor there.
I like Elizabeth Warren, she came up the hard way, out of a hard-working middle class family.