I would really love to hear Time Kaine and Ed Rendell (and other Dems calling on Weiner to resign) explain why Bill Clinton shouldn't have resigned over his behavior.
The reason Bill Clinton didn't need to resign, even though Al Gore really wanted him to, was because he was El Presidente, and nothing short of impeachment would remove him from office.
Weiner doesn't have the power of the Chief Executive and can maybe face some Congressional penalties, so fighting and staying in the HOR will be tough if he faces the sanctions. He might decide it is better to be a wealthy lobbyist than a HOR.
Well of course the reason he didn't resign is because he didn't have to. That's why I said "should".
EDIT: I mean, look, these are the actual words used by Tim Kaine, regarding Weiner:
If that's what Kaine thinks, then was he also in favor of Clinton resigning back in 1998?