Rudy Giuliani has a lot to learn about campaigning outside of New York City. The former New York mayor attended a roundtable discussion with heavy-hitters at the Oklahoma History Center in Oklahoma City recently. Two of the three co-hosts were natural gas billionaires who are CEOs of Fortune 500 companies. “Mayor Giuliani was doing fine until one CEO asked him what his energy policy was,” a participant said. “He gave a very detailed and lengthy answer covering every energy source imaginable, but he never once uttered the words ‘natural gas.’ Considering where he was, who he was talking to, and...