This is a devastating blow. I can't think of another endorsement of Hillary continuing her campaign that would give dedicated Democrats who support her more reason to pause.
I am speaking, of course, about the man who knows more than anyone in America about hurting Democrats by refusing to quit an election that you won't win.
The one and only Ralph Nader, in a message posted on his website, urges Hillary to carry on the struggle. Excerpt below the fold.
Senator Clinton:
Just read where Senator Patrick Leahy is calling on you to drop out of the Presidential race.
Believe me.
I know something about this.
Here's my advice:
Don't listen to people when they tell you not to run anymore.
...
Just like every other citizen, you have a right to run.
Whenever you like.
For as long as you like.
It's up to you, Hillary.
Just tell them -
It's democracy.
Get used to it.
Yours truly,
Ralph Nader
(edited: I didn't want to say that Hillary can't win. She could.)