James Taranto: When NBC's Tim Russert asked John Edwards on Sunday if he, as president, would accept a nuclear-armed Iran, the silver-tongued lawyer got tongue-tied: "I--there's no answer to that question at this moment. I think that it's a--it's a--it's a very bad thing for Iran to get a nuclear weapon. I think we have--we have many steps in front of us that have not been used. We ought to negotiate directly with the Iranians, which has not, not been done. The things that I just talked about, I think, are the right approach in dealing with Iran. And then we'll, we'll see what the result is. . . . I think--I think the--we don't know, and you have to make a judgment as you go along, and that's what I would do as president." Less than two weeks earlier, Mr. Edwards had spoken by satellite to Israel's annual Herzliya Conference. "Let me be clear: Under no circumstances can Iran be allowed to have nuclear weapons. . . . To ensure that ...