I guess he is getting bored with the Appalachian Trail:

Former South Carolina Gov. Mark Sanford is launching a political comeback that may begin within days.

Sanford is planning to run for the Congressional seat he held almost a decade ago, a Republican source familiar with his thinking told CNN late Thursday.

“He’s looking all but certain to do it,” said a former top aide to Sanford, who did not want to be identified while prematurely revealing the plans.

I’m sure the right will rally behind him and blast anyone that brings up his little indiscretion that cost him his job as Governor of South Carolina. After all, he is a Republican and talking about their affairs is never appropriate. You can only talk about affairs if the person happens to be a Democrat.