Could it be a Republican? Lynn Sweet at the Sun-Times thinks it's a live possibility:
Democratic Party leaders in Washington -- and the Obama White House -- failed to recruit a candidate strong enough to scare Rep. Mark Kirk -- the Republicans' best bet -- from the race. The only luck they had was the decision by Sen. Roland Burris -- appointed by now-indicted former Gov. Rod Blagojevich to fill Obama's remaining term -- not to run to keep the seat.This seat did belong to a Republican in 2004.
When one party thinks it has a lock,
solid as a rock,
they're often in for a shock.