PORTLAND, Ore. (AP) — The fate of a little-noticed ballot measure in strongly Democratic Oregon serves as a warning to President Barack Obama and his party about the political perils of immigration policy. Even as Oregon voters were legalizing recreational marijuana and expanding Democratic majorities in state government, they decided by a margin of 66-34 to cancel a new state law that would have provided driver's licenses to people who are in the United States illegally. Obama is considering acting on his own, as early as this week, to possibly shield from deportation up to 5 million immigrants now living...