CHARLOTTE About 15 young people, including at least seven who are not authorized to be in the U.S., were arrested on misdemeanor charges of disorderly conduct and impeding traffic during a sit-in rally Tuesday to protest immigration laws. Among those arrested was Martin Rodriguez of Hamptonville who is a member of a Yadkinville immigrant advocacy group called El Cambio. The rally was held just after a preview kickoff rally held separately by the Democratic National Convention in advance of the 2012 presidential nominating convention that will be held in Charlotte. Rally organizer Domenic Powell, a founding member of the advocacy...