A Medford man is accused of running down his girlfriend's mom after he got behind the wheel of his car drunk.Police say the incident happened at a graduation party Saturday on Ocean Avenue in West Islip. They say 30-year-old Kenneth Gonzalez got into a fight with several members of his girlfriend's family. Officials say that Gonzalez then got into his car, drove backwards and ran over 49-year-old Denise Stark. Stark has a broken neck and is listed in serious condition. Stark's daughter told News 12 Long Island that the car accidentally went into reverse as Gonzalez was trying to leave the fight.Gonzalez has been charged with driving while intoxicated.