Robert Robb, columnist for the Arizona Republic, the daily newspaper of Phoenix, writes here that Arizona has a good chance of winning its recently filed lawsuit against part of the federal Voting Rights Act. The case, filed last week, is State of Arizona v Holder, U.S. District Court, Washington D.C., 11-1559. It has been assigned to U.S. District Court Judge Amy Berman Jackson, an Obama appointee. It argues that the pre-clearance parts of the Act are unconstitutional. The law has been upheld many times in the past, but past precedents may no longer control, as the column explains.