One Monday evening this March, I had a remarkably forthright two-hour conversation with Ginger Sawyer, one of the most powerful lobbyists in Louisiana. As we sat across a table at a TJ Ribs in Baton Rouge, Sawyer filled me in on the oil-and-gas industry’s goals for the 2013 state legislative session. She’d retired the previous year, following a bout with cancer and the death of her longtime partner in a freak accident, but had been called back in on a one-year contract by the Louisiana Association of Business and Industry in part because the state’s petroleum companies were facing…