Arizona's Maricopa County Sheriff Joe Arpaio told WND he has assigned a five-member "Cold Case Posse" to investigate the authenticity of Barack Obama's birth certificate. The decision, he says, is simply a matter of doing his duty. "This investigation does not involve politics," Arpaio told WND. "I listen to all the residents of Maricopa County who come to my office with complaints, regardless what their politics are. "My door is open to everyone, and I don't kick them out. If a complaint is legitimate, I don't dump it into the wastebasket," he continued. "When I get allegations brought to me...