Reuters: An influential small business lobby group said on Friday it had joined 20 states in a lawsuit arguing insurance coverage requirements in the newly enacted healthcare overhaul are unconstitutional. The National Federation of Independent Business announced its decision ahead of a news conference in Florida with state Attorney General Bill McCollum to discuss the lawsuit. McCollum is seeking the Republican nomination to run for Florida governor and was one of the first state officials to sue the federal government over President Barack Obama's sweeping healthcare reform passed by Congress in March.