The New York Times today changed its ranking of the governor's race to Tom Corbett's favor, though it didn't give a reason for the change.

From the Times' Jeff Zeleny:

Pennsylvania: The governor’s race shifts to Leaning Republican from Tossup. To succeed Gov. Edward G. Rendell, a Democrat who is retiring, Tom Corbett, the Republican attorney general, is facing Dan Onorato, the Allegheny County executive in Pittsburgh.