Hillary Clinton has her own paper/video trail, a husband with a presidential track record, and a political defeat by forces to her left in her human history. And now she wants to try for the brass ring again.
What is a body to do when a flank of your party ain't crazy about you?
Flank is an apt choice of words. If we go back to Clausewitz and his Principles of War (gotta use war analogies for everything!) then the principle of economy of force would state that you put a minimum of power into secondary efforts.
The "left flank," if you will, of the Democratic party is certainly still secondary. The base is still pretty centrist, and Hillary lost in 2008 to a candidate who was barely to her left...or perhaps more accurately less center-right than she was. That candidate is now off the table as a challenger, and I'd bet dollars to donuts that he'll use whatever juice he has left in his office to campaign hard for his former rival when the time comes.
And while it is true that the left flank has become somewhat louder in the past couple of years, the Bernie Sanders/Elizabeth Warren wing of the party need only be placated by Hillary/Obama and the center right majority.
The left in the Democratic party is nowhere near as powerful as the Tea Party wing of the Republicans has become.