Usher has shown his support for presidential candidate Barack Obama, but agreeing to perform at the Democratic Convention next month.Usher's manager Benny Medina reveals Usher has been approached about appearing at the event in Denver, Colorado in August.Medina tells the New York Daily News, "There've been offers to do things in and around the convention and we are just looking to see which one will be the most productive. He is obviously a huge Barack supporter."

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