Texas-based Valero Energy -- which owns gas stations across the country, like this one in Sacramento,Calif. -- has contributed about half of the roughly $10 million behind California's Proposition 23 campaign. Rich Pedroncelli/AP hide caption

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Rich Pedroncelli/AP

Oil Firms Bankroll Calif. Climate-Change Measure

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S.F. Ballot Measure Targets City's Homeless

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Corruption Trial Of Tom DeLay Begins In Texas

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Border Security Stirs Voters In Texas

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Boehner, Obama Clash In War Of Words

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Midterm Predictions: House, Senate, Gubernatorial

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