With the healthcare battle still unfinished, the Obama administration has been laying plans to take up an issue that could prove even more divisive -- a major overhaul of the nation's immigration system. Senior White House aides privately have assured Latino activists that the president will back legislation next year to provide a path to citizenship for the estimated 12 million illegal immigrants living in the United States. In a recent conference call with proponents, White House Deputy Chief of Staff Jim Messina, political director Patrick Gaspard and others delivered the message that the White House was committed to seeing...