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Both proponents and opponents of tax-funded vouchers recognize that a victory for vouchers in the District of Columbia would be an incentive for their spread elsewhere in the country . Over the last decade , the charter movement - which began as a single school with 20 students - has blossomed into more than 2,400 schools and half a million students across the country . We went for diversity — fettuccine Alfredo with shrimp , a spinach calzone and , of course , a couple of gourmet deep-dish pizzas . But the ribs did n't have a smoky taste or any char , and that made us think they were cooked in an oven . They have no tenure , work under year-to-year contracts and risk dismissal if they fail to contribute to student achievement as judged by the school .