San Francisco Chronicle: Just three years ago Richard Pombo, the cowboy boot-wearing Tracy Republican lawmaker, faced an outcry from Democrats for pushing a bill to lift the 27-year-old ban on drilling off the East and West coasts and let states choose whether to allow oil rigs off their shores. In a sign of how much the energy debate has shifted in an era of nearly $4-a-gallon gasoline, virtually the same proposal that Pombo floated will be introduced on the House floor this month – by Democratic House …