WASHINGTON -- President Bush's job approval has fallen to the lowest level of his presidency amid worries over the Iraq war, a fumbled Supreme Court nomination, the indictment of one White House aide and uncertainty about another. Concerned that the president has lost his footing, some influential Republicans are urging Bush to shake up his staff and bring in new blood. A new AP-Ipsos poll found Bush's approval rating was at 37 percent, compared with 39 percent a month ago. About 59 percent of those surveyed said they disapproved. The intensity of disapproval is the strongest to date, with 42...