** The "Clean Energy" initiative, Proposition 87, on California's November ballot is looking good. The support level for it in a private poll is over 60 percent. The measure would enact an oil extraction tax at the wellhead to generate some $400 million a year for research and development on alternative fuels. Among the nation's big oil producing states, California is the only one without an oil tax. Voter disdain for oil companies is high.