After weeks in which the political discourse was nearly dominated by the scrutinizing of Sen. John F. Kerry's conduct in the Vietnam War era, President Bush now may find himself under the microscope and on the defensive for actions in his past. Kerry supporters are actively questioning Bush's spotty record as a stateside National Guardsmen during the Vietnam War. A former senior politician in Texas is telling people he pulled strings to get Bush into the guard. And an Associated Press investigation has concluded that key documents that should have been written to explain gaps in Bush's guard service are...