Jeffrey Goldberg recommends Mark Sanford consider it. As the Merck Manual explains:
Dissociative fugue involves one or more episodes of sudden, unexpected, but purposeful travel from home during which people cannot remember some or all of their past life, including who they are (their identity). These episodes are called fugues.
Dissociative fugue affects about 2 of 1,000 people in the United States. It is much more common among people who have been in wars, accidents, or natural disasters.
Not sure his fight with the legislature over the stimulus qualifies, but this may still be his best bet.
--Christopher Orr