Political observers online and on television Monday wondered if a gaffe-filled Sunday TV appearance by South Carolina Gov. Mark Sanford has eliminated him as a viable Republican vice presidential candidate. Sanford was interviewed on CNN Sunday morning, billed by the network as a candidate on presumptive Republican presidential candidate John McCain’s short list of vice presidential options. When the governor was asked by Wolf Blitzer, the host of “Late Edition,” how McCain can draw distinctions between himself and President Bush on the economy, Sanford lost his train of thought, struggling for several seconds to come up with an example. “I’m drawing a blank, um, I hate it when I do that, particularly on television,” Sanford said finally. Sanford then cited NAFTA, the North American Free Trade Agreement, as a policy in which McCain and Bush disagree. ...