Burris has run into some trouble at his testimony to a Chicago House panel investigating Blagojevich. Burris, it seems, contacted Blagojevich (though an intermediary) about the Senate seat much earlier that he has previously admitted. This raises the possibility that he was involved in Blagojevich’s effort to strike a corrupt bargain for the seat, and the fact that he lied about it lends some additional weight to the possibility.
If the Senate wants to reverse its capitulation to Burris, this would give them justification to do so.