21-12 win over Chargers moves them to 18-0 and into the Super Bowl
                                
                                
                                    (Newser) -
                                    The '72 Dolphins must be nervous after New England stayed perfect today by defeating an injured Chargers crew, 21-12, and advancing to a fourth Super Bowl in seven years. The Patriots had to work for it, suffering a lackluster effort from Tom Brady, and riding rusher Lawrence Maroney for 122...