According to The Fix, the Post's politics blog,
"That news may come as something of a surprise to supporters of Sen. John McCain (Ariz.), whom Sanford backed in South Carolina's 2000 primary. But the Palmetto State governor insists his decision (or, more accurately, indecision) is not meant as a "slap" at McCain but rather part of a concerted effort on his part to find the candidate in the field truly dedicated to fiscal conservatism.
"'I am not committed at this point,' said Sanford, who acknowledged that "a long list of characters" considering the 2008 race have reached out to him. 'I am really going to look very hard at somebody who will espouse that notion of fiscal discipline and financial stewardship. That would be at the top of my list.'"