PROVIDENCE, R.I. — When Rhode Island became the 13th state to allow in-state tuition for illegal immigrants at public colleges, supporters heralded the move as one that would give students the kind of advanced education they need to succeed in the workforce. But students who are not here legally may still face a major obstacle even with the benefit of a college degree: Many have no immediate pathway to legal status and, under current federal immigration law, employers cannot legally hire them. "I know of students who have graduated magna cum laude and top honors in their colleges, but right...