SACRAMENTO — The 2008 presidential campaign will take center stage this weekend at the California Republican Party convention, as one of the leading GOP contenders — former New York Mayor Rudy Giuliani — addresses delegates Saturday and seeks to build on an already strong organizational advantage in the Golden State. Although delegates are also scheduled to hear from Gov. Arnold Schwarzenegger tonight, the partisans at the convention are already looking ahead. "This won't be an Arnold convention," said former Assemblyman Tony Strickland of Moorpark. "This will be more of a Giuliani convention." Giuliani, who this week formed an exploratory committee...