During a swing through Northern California this week that included a close encounter with a mechanical milker, former New York Mayor Rudy Giuliani snitched a bite of blackened chicken quesadilla off a woman's plate at Mimi's Diner in Fresno. In Southern California next week, Sen. John McCain, R-Ariz., will appear in the Los Angeles area with Gov. Arnold Schwarzenegger to promote his climate-change policies and talk about how they can be taken national. Both stops are precursors of a seismic shift taking shape in presidential politics -- California as a top priority for Republicans. The nation's largest state has always...