SAN DIEGO When members of an anti-illegal immigration group offered to sponsor litter cleanup on local roads, they never imagined California officials would offer them an Adopt-a-Highway stretch near a Border Patrol checkpoint on Interstate 5, the main artery carrying illegal migrants north from the U.S.-Mexico border. On Friday, lawyers for the San Diego Minutemen told a federal judge that the state had no right to rescind the offer after state legislators complained to the California Department of Transportation. The group asked that its blue Adopt-a-Highway sign be put back where it stood without incident for about six weeks until... ...