Churchill Art Piece Called Into Question by CBS4 News reporter Raj Chohan Feb 24, 2005 8:03 pm US/Mountain BOULDER, Colo. (CBS4) Boulder County resident Duke Prentup has been a fan of native American art for as long as he can remember. That love of art took him to the home of Ward Churchill in the early 1980's, where Prentup bought several pieces of Churchill's art, including a serigraph titled "Winter Attack." "I have enjoyed them ever since immensely, they're obviously up inside my house," Prentup said. Last month came a stunning revelation, though, as as Prentup flipped through a 1972...