Breaking news from Talking Points Memo:

It's being reported now on the cable networks that Sen. Tim Johnson (D-SD) has had a stroke this afternoon on Capitol Hill...

[Democrat] control of the senate hinges on Sen. Johnson's ability to serve in the 110th Congress. Were he unable to do so, South Dakota's Republican governor would appoint a Republican and control would go to the Republicans -- a 50 - 50 tie with the tie break from Cheney.

The first question has to be: "stroke"???