Because he's a Democrat. DNC stands for "Dere's No Consequences".
The media will breathlessly report tonight how he stood in front of the cameras and 'took full responsibility,' and that becomes the template: Responsibility without consequences (for dems). He won't step down; he'll ratchet up the rhetoric. By the next election, his dumbass constituents will be lauding his courage and honesty for having stood up in front of the microphones and 'taken responsibility.'
Glenn Beck on now. I bet he is laughing out loud. Weiner is the guy who tried to bring Glenn down and get all the sponsors to drop the program. Revenge is sweet when you don’t have to even plan it.