SIOUX CITY, Iowa — Optimism was supposed to be on display yesterday........... --SNIP-- .......but someone forgot to give Teresa Heinz Kerry the positive message. As 1,000 people waved signs reading "American Optimism," the would-be first lady ripped President Bush. "There's a lot we know isn't going right," Heinz Kerry said after assailing Bush's agenda. "But the most insidious and probably most debilitating of all of it is the lack of dignity and respect perpetrated on the American people. That is not American." Bush campaign spokesman Terry Holt called the remarks "shrill and angry attacks."