In my opinion right now Elizabeth Warren is possibly the most powerful political figure in the country.
What I mean by that is I think she has the power to actually sway the outcome of the Democratic race. And beyond that the general as well.
If she endorses Bernie Sanders she essentially pushes his poll numbers through the roof, and if she endorses Hillary this whole nominating process is over.
If she agrees to share a ticket with Bernie now I believe that will prove too much for the Clinton campaign to overcome, and if she joins Hillary's ticket in the general I think she will help to steamroll over any candidate the GOP could possibly nominate.
So yes I think that Warren is the political juggernaut, perhaps even more powerful than President Obama himself, at least as it concerns this current election cycle.