Congress’s border deal talks might be ongoing‚ but in one essential area‚ legislators are moving backward: The ‘dreamers‚’ undocumented immigrants who came to this country as children‚ have been left out of the conversation. Since the first version of the Dream Act was introduced almost a quarter-century ago‚ support for the young people who are Americans in every sense but the legal one has been a bright spot of bipartisanship amid acrimony. Almost every immigration compromise that...