Cruz, Rubio face critical test in Nevada

LAS VEGAS — Ted Cruz is fighting to keep from spiraling out of contention. Marco Rubio is fighting to prove he can build on his recent momentum. And Donald Trump, with his rivals locked in a battle for second, is fighting for a third straight victory to expand a delegate lead that could soon become insurmountable. Tuesday night’s Nevada caucuses force a critical test on the Republican Party’s leading presidential candidates. “I think it’s the most unpredictable of a