Wall Street Journal: Sen. John McCain is putting energy policy at the center of his presidential campaign, embracing a diverse array of positions that defies easy categorization. He is for more oil drilling and also for alternatives to oil. He wants to drill off the coasts but not in the Arctic National Wildlife Refuge. He supports subsidies for nuclear power and clean-coal technology, but has opposed them for ethanol, solar and wind power. He wants to lower gasoline prices by temporarily …