John Ensign in 1998:

Clear differences emerged during a series of questions from the audience. Ensign repeated his call for President Clinton's resignation in light of his admitted affair with former White House intern Monica Lewinsky. Reid called the affair immoral but said he would "keep an open mind" and let the process proceed before deciding whether to impeach Clinton.

John Ensign in 2007:

Republican Sen. John Ensign of Nevada said Thursday it would be best for the Senate and the GOP if Sen. Larry Craig resigned, but stopped short of calling for the Idaho Republican's resignation over his arrest in an airport men's room.

"I wouldn't put myself, hopefully, in that kind of a position like that but if I was in a position like that, I think that's what I would do," Ensign told The Associated Press. "He's going to have to answer that for himself... I think the pressure will continue to build."

Nate Silver says not to expect a resignation by Ensign following the revelation that he had been engaged in a long-term affair with a married staffer. That's probably not wrong, particularly considering that the last two Republican Senators to find themselves caught in hypocritical moral situations -- David Vitter and Larry Craig -- were able to weather their storms. What's more, unlike Vitter and Craig, Ensign's scandal is breaking at a time of major news saturation, with the election in Iran, healthcare reform and the Sotomayor nomination all occurring simultaneously. Then again, Ensign is quite strongly on the record calling not once but twice for the resignation of a public official for an act of moral indiscretion, so I wouldn't assume he's going to get out of this scandal too easily.