The United States has no business accommodating a permanent underclass of illegal workers, whose ranks have grown to at least 6 million. Problem is, the reform plan with the most momentum in D.C. would make an untenable situation worse. The flawed AgJobs bill, first introduced in 2003, would cover no more than 10 percent of the illegal labor force. And it would grant those workers de facto amnesty, moving them ahead of legal immigrants who've obeyed the law in their quest to reach America. It would mock the orderly process of naturalization, when there are alternatives -- including other guest-worker...