Politico: Defenders of California’s global warming law are bracing for a last-minute spending blitz from oil companies determined to nix one of the state’s premier green crusades come Election Day. But the big money may not come. Other than a $500,000 check last week delivered from Houston-based Marathon Oil, most of the cash raised by industry to overturn California’s signature climate policy came much earlier in the year, when the race appeared closer. “They could put in $50 …