President Obama's executive actions on immigration threw gasoline on the fire of border politics — and nowhere is it burning hotter than in Nevada, where incoming Senate Minority Leader Harry Reid (D-Nev.) is gearing up for a tough reelection. Obama chose the Silver State, which has proportionately more illegal immigrants than anywhere else in the country, to begin a tour aimed at winning support for his decision to stop deportations for as many as 5 million people. His first shout-out in a Friday speech at a heavily Hispanic Las Vegas high school went to Reid, who has been emphasizing his...