So Why is Trent Lott Resigning?
I guess millions as a lobbyist is a pretty convincing rationale, but there's also this:

HUSTLER Magazine has received numerous inquiries regarding the involvement of Larry Flynt and HUSTLER in the resignation of Trent Lott. Senator Lott has been the target of an ongoing HUSTLER investigation for some time now, due to confidential information that we have received.

Think Lott's (R-MS) been using Senator Vitter's (R-LA) phone book? Or Senator Craig's (R-UT) tap routines? Or Mark Foley's (R-FL) instant messaging service? Or some new bizarre Republican behavior we haven't yet imagined?