Illinois Democratic governor Rod Blagojevich must find a replacement for President-elect Barack Obama, who will resign his Senate seat Sunday. The first-term Senator was the only black in the Senate and the choice of his successor will be a huge political gift to whomever gets it (for Blagojevich as well ? he's become reviled since his election in 2002). But with no choice expected soon, Democrats retain a tenuous majority in the Senate ? McCain supporter Senator Joe Lieberman, ID-Conn., is a wild card ? as lawmakers consider economic stimulus legislation.