Buried in the president's budget this week was enough money to dramatically transform educational opportunity for children in the nation's capital, one of the worst school systems in the country. As part of his continuing program to leave no child behind, President Bush has proposed a modest $756 million to promote school choice programs in the District of Columbia and several other cities. But the proposal faces tough opposition from Democrats beholden to teacher unions, who see school vouchers as a mortal threat. Nowhere could there be a starker contrast between what's good for kids and what's in the...