ou can't blame the Democrats for making the most of the Bush administration's message malfunction on trade and jobs. When the president's top economist suggests, even hypothetically, considering hamburger-flipping a form of manufacturing, it's a golden opportunity to accuse the White House of being out of touch with the concerns of working Americans. ("Will special sauce now be counted as a durable good?" Representative John Dingell asks.) And the accusation sticks, because it's true.But the Democratic presidential candidates have to walk a tightrope. To exploit the administration's vulnerability, they must offer relief to threatened workers. But they also have to...