I have said for a while that Warren is the logical choice for the Dems. Hillary is old, tired, mean, unlikable, and has a lot of baggage. Hillary is the correct gender, and has ties to St. Bill, (the first black president), so she's getting serious run. But she really is unlikable.
Warren is very much like Obama in that she is a hardcore progressive, a proven liar, has no real accomplishments, and the far left loves her. And obviously she is the correct gender. Women, even some self proclaimed conservative women, will vote for Warren simply because of her gender.
With Hillary flaming out, I think Warren will be the lead of the 2016 Democrat ticket.