Friday, Mar. 26, 2004 2:35 p.m. EST Discovery's 'Dean Scream' Documentary This weekend, the Discovery Channel will take a look at the "Dean Scream," and other un-presidential gaffes that caused America to turn away from various presidential candidates. In describing the program, the Discovery's homepage says, "Howard Dean may have wondered what all the fuss was about after his exuberant scream in Iowa. He found out in the next few days. But Dean is in good company: Some of the nation's most accomplished politicians have suffered setbacks, because of gaffes or just plain bad luck." Here are a few examples:...