I'm no fan of Senator Stevens of Alaska (see my blog of 10/27/08) but I know the reason the Republicans reelected Stevens was to maintain at least 60 seats so they can filibuster what many of predict will be some disastrous special interest legislation submitted by the Democrat majority.
The Democrats will find themselves between a "rock and a hardspot". If they expel Stevens from the the Senate, which ethically they should do, the Republicans will fill the seat with another Republican, possibly Governor Sarah Palin, who would then get the "seasoning" MSNBC and many Republicans said she is lacking to be presidential material.(Good grief, think Joe Biden or Nancy Pelosi!).
And yes, Blago, if he ran again would be reelected by the Democrats. (Here, again, think Jehan Gordon).