Gov Rendell doesn't have the power to extend the absentee ballot deadline?

From MSNBC:

Yesterday, in hotly contested Pennsylvania, Gov. Edward G. Rendell (D) agreed to a seven-day extension to settle a federal lawsuit in that state after initially resisting the idea. As a result, military ballots there may be received through Nov. 10. Republican officials are considering a new lawsuit to push back that extension further.

Oops, guess he did.