Because, as it stands, a (legal and legitimate) victory of Senator Clinton is a mathematical near-impossibility. And it is questionable whether her continuing presence is of ultimate benefit to her party's fight-worthiness and readiness come November.
No matter your political affiliations or affections. Senator Clinton made, at best, a serious mistake. A mistake she should make amends and be taken to task for.
No matter whom you support, some acts are simply indefensible.
Thank you for coming on and debating this intelligently. See, we don't mind if people have opposing view points, but it needs to be presented in a fashion where we want to become defensive.
First, yes even Senator Clinton knows it's a near impossiblity that she can win. She has said in her own words she wants to finish for all the voters who voted for her and she wants MI and FL to be seated. Now, I do think she wants to negotiate a position for herself politically. Who knows what that is. I just like that she's fighting for her voters who want her in the White House. YMMV.
I seriously think she DIDN'T make a serious mistake. I don't see what the big deal is.

I'm thinking that she referenced this time, because more people would have remembered it because it was a tragic time in history. I don't know about you, but I remember a lot of things associated around the time of 911, because it was such a tragic time and everything got lumped into that TIME. Not everyone is going to remember just any long term primary...just because. That's my story and I'm sticking to it.
You (sdy) think that it's a terrible mistake that she's made and I totally respect your view on it, but I don't have to agree and I told you why I think the way I do.