Hillary knows this is her absolute last shot at the Presidency and I know she hates Obama and still harbors a grudge over 2008.
If she withdraws, her political future is over. If she stays in, there still is a chance (hopefully one which is shrinking) that she can still win.
I think her ego and vindictiveness will keep her in the race. I think she would rather burn down the entire DNC than step aside for Biden/Warren or Bernie.
Remember she still probably has a bunch of files on DNC leadership and who knows what info she learned while compromising our national security with other countries.
I’d get lots of popcorn if I knew that there would be an Obama/Clinton civil war this summer.
That would be sweet!