SACRAMENTO - He's used his millions to benefit exotic show horses, a home for retired chimpanzees - and California's actor-governor. William Armsted Robinson has quietly become one of Gov. Arnold Schwarzenegger's top donors, periodically trading off the pinnacle with San Diego Chargers owner Alex Spanos and Spanish language television entrepreneur Jerry Perenchio. Stockton real estate developer Spanos and Univision owner Perenchio are high-profile businessmen with long-term interests in California. But Robinson is an elusive, reclusive man whose first major foray into influencing politics is the $650,000 he has given Schwarzenegger. Schwarzenegger fund-raiser Marty Wilson describes Robinson as a "very private,...