NASHVILLE SKYLINE: Shut Up and Sing? Chet Flippo 03/20/2003 (NASHVILLE SKYLINE is a column by CMT/CMT.com Editorial Director Chet Flippo.) So, what to make of the Natalie Maines mess? Because that's just exactly what it is, a big mess. Maines seems afflicted with chronic foot-in-mouth disease. In her latest lecture, on March 10 at a Dixie Chicks concert in London, Maines felt compelled to tell the audience, "Just so you know, we're ashamed the president of the United States is from Texas." She could not have made a stupider mistake. First of all, if she really has strong convictions about...