Control of the Senate may shift to the Republicans

Democratic Senator Tim Johnson from South Dakota has suffered a stroke. Does this mean we have lost control of the Senate? The Governor is a Republican.

Update:

From Raw Story:

If Johnson were to pass away, or be forced to retire, the US Constitution delegates the task of appointing a replacement to South Dakota lawmakers, who in turn, often turn that task over to the Governor. The Governor of that state, Mike Rounds, is a Republican, and both houses of the state legislature are dominated by Republicans.

However, in the case of South Dakota, the decision falls to Rounds, whose appointment would serve as senator until a special election held between 80 and 90 days after the vacancy.

It doesn't look good. There's more than one good reason to pray for his speedy recovery.