Dems sweep Congress in 08...
Don’t you mean 98?
Personally I’m not sure there would have been that much difference, though a big plank the Republican’s used in 1998 and 2000 wouldn’t have been there, Gore would probably have won but not in a landslide there where bound to have been plenty of “Reagan Democrats” who voted for Bush on the basis of “restoring honour to the white house” who may not have otherwise. As for “Sweeping Congress” I doubt it, Scotty Baesler would have beat Bunning and Mike Coles might have beaten Coverdell but these where probably the only races where the impeachment might have helped the GOP hang on, in many ways the impeachment was not important though in close races it did have an effect and without Gore might well have won firstly because he wouldn’t have distances himself from Clinton and secondly becomes he would have won round more of the “values voters”.