By James E. Ryan, law professor and author of “Five Miles Away, a World Apart: One City, Two Schools, and the Story of Educational Opportunity in Modern America.” Last week’s speech by Mitt Romney, in which he presented his education reform plan to a group of Latino leaders in Washington, drew attention mainly because he criticized teachers’ unions and endorsed private school vouchers. ... But another part of his plan that potentially veers far from the usual conservative talking points received almost no attention: Mr. Romney would give poor students and thosewith disabilities the right to at...