SAN DIEGO - The California Republican Party urged those attending this weekend's state convention to don their Hawaiian shirts and flip-flops for a gathering that would be "very fun and casual." But most of the more than 800 activists attending the three-day gathering stuck to more formal attire and exuded a very serious attitude about improving the party's prospects in the state. With public opinion polls showing President Bush and GOP Senate nominee Bill Jones trailing their Democratic opponents in California by double digits, some Republicans who celebrated Republican Arnold Schwarzenegger's election just 10 months ago are dismayed to see...