Backers of a measure that would hit energy companies drilling in California with $4 billion in new taxes planned to start running a hard-hitting TV ad across the state today urging voters to "make oil companies pay.'' There's nothing subtle about the new ad, said Paul Begala, a consultant for Proposition 87. "We're not shy; our most important goal is to get California off its dependence on oil,'' said Begala, a former Clinton White House aide and CNN television commentator. "If you want support, you have to build support.'' Prop. 87 would tax companies for oil pumped in California, based...