From Political Wire, which may have gotten the information from the Rothenburg Political Report:
Don’t be surprised in four years if a couple significant Georgia Republicans attempt to switch roles. In 2010, Gov. Sonny Perdue (R) will be term-limited and could very well seek an open U.S. Senate seat, vacated by Sen. Johnny Isakson (R), who would run for governor, according to one GOP insider familiar with the situation.
Read the rest here.