She won't run. I'd give it less than 10% chance she will. Having said that, I can definitely see why liberals desperately want her to run. But they shouldn't. A Clinton presidency is much to be preferred to a Paul/Bush/Christie/whatever presidency, which WILL happen if Warren is nominated. Someone speaking the truth like her cannot win the presidency, unfortunately. At least not yet.
Why not? Is she any more liberal than Gary Hart? He was leading in the polls before the affair.
Oh, I'm not saying that she can't beat Clinton. Infact, I think she is the only one who has a legitimate shot at beating Clinton. I'm saying that she can't beat the republican nominee, as long as the GOP nominates someone electable (i.e. not Ted Cruz or Rick Santorum).