News media converged on Tan Nguyen's Garden Grove campaign office Friday expecting to hear from the Republican congressional candidate about a mailer sent out this week warning immigrants against voting in the November election. Instead, the media horde got a front-row seat to a half-dozen agents from the state Attorney General's Office serving search warrants and combing through Nguyen's office. Officers confiscated three computer hard drives, checked for fingerprints, leafed through files and interviewed Nguyen's attorney. Agents also searched Nguyen's Santa Ana home and a campaign worker's Anaheim home. Despite burgeoning state and federal probes into the flier, Nguyen's attorney...