Newly retired State Rep. Jonathan Hecht thanked the supporters who gathered outside his home to thank him for his work representing Watertown for almost 15 years. Longtime 29th Middlesex State Rep. Jonathan Hecht received a serenade some of his biggest supporters on Wednesday, who thanked him for his 12 years representing Watertown on Beacon Hill. Supporters from Watertown and Cambridge sang Hecht a song thanking him for his work on Beacon Hill, including the improvements to the Charles River Park, the Watertown/Cambridge Greenway bicycle and pedestrian path, support for clean energy, transportation and health care. Hecht came out of his home, still bleary eyed from his last day as state rep, which lasted until the early hours of Wednesday. He told the gathering of about two dozen people the day had been a strange and bittersweet one.