Gov. Arnold Schwarzenegger has pointedly refused to endorse fellow Republican Meg Whitman in the race to succeed him and has stayed largely quiet on most of the major ballot measures. But he is campaigning across the state with remarkable passion to defeat Proposition 23, a measure that would suspend California's landmark global warming bill, one of the signature achievements of his administration. "You have to be aware that whatever you do can be undone by outside forces," Schwarzenegger said in an interview with the Mercury News, referring to the Texas oil companies that are the primary financial backers of Proposition...