WASHINGTON, DCFielding questions from reporters at a Tuesday press conference, President Bush defended his adherence to the principles of deny-side economics. 'Nope,' the president said. 'I keep hearing people say that the U.S. economy is troubled, but that isn't true. Our economy is strong. We just have to keep on doing what we're doing, and everything will work out.' Leading economists say they are curious to see whether the president's optimism will trickle down into the public consciousness. 