Gen. Wesley Clark, acting as a surrogate for Barack Obama’s campaign, invoked John McCain’s military service against him in one of the more personal attacks on the Republican presidential nominee this election cycle. ADVERTISEMENT Clark said that McCain lacked the executive experience necessary to be president, calling him “untested and untried” on CBS’ “Face the Nation.” And in saying so, he took a few swipes at McCain’s military service. “He has been a voice on the Senate Armed Services Committee. And he has traveled all over the world. But he hasn't held executive responsibility. That large squadron in the Navy...