Weinstein Co. buys Dixie Chicks docu By Gregg Goldstein NEW YORK -- Barbara Kopple and Cecilia Peck's politically charged documentary "Dixie Chicks: Shut Up and Sing" has been picked up for worldwide distribution by the Weinstein Co. A release is tentatively scheduled for the fall, possibly right before the November elections. The film revolves around the aftermath of singer Natalie Maines' statement at a 2003 London concert, where she said, "Just so you know, we're ashamed the president of the United States is from Texas." It chronicles death threats, political attacks and radio boycotts against the band, and that could...