A host of Hollywood stars including Robert De Niro, Tony Bennett and Paul Newman have added their support to US Senator Hillary Clinton's re-election campaign. The former First Lady is being endorsed in telephone messages prerecorded by the stars, known as 'robo-calls', across New York state. Bennett says in his message, "Some people think I left my heart in San Francisco, but it really is right here in New York. That's why I'm promoting Hillary." Meanwhile Goodfellas star De Niro explains how Clinton "took on the Bush administration" to keep a Dubai-owned company from managing the city's ports. Newman's answer phone effort has yet to debut. Democrat candidate Clinton is hoping for re-election when voting takes place on 7 November (06). She has held the position since 2000.