LA Times: The Valero oil refinery sprawls over 140 acres beside the Port of Long Beach, a treeless tangle of steel pipes, smokestacks, boilers and storage tanks fenced in by chain link and razor wire. Austere and utilitarian, it seems an unlikely launching pad for a high-profile political revolt. But the sign in front of the Wilmington refinery, in bold black and red letters, says: “On November 2d, Vote Yes on Prop 23.” Bill Klesse, chief executive of Valero Energy Corp., the nation’s biggest independent…