Donald Trump has more than doubled his national lead in the Republican presidential race ahead of Thursday night's GOP debate here, according to the results from a new NBC News/Wall Street Journal poll. Trump is the first choice of 33 percent of national Republican primary voters - his highest percentage in the poll. He's followed by Ted Cruz at 20 percent, Marco Rubio at 13 percent and Ben Carson at 12 percent. Chris Christie and Jeb Bush are tied at five percent. No other Republican presidential candidate gets more than 3 percent. Trump's 13-point lead over Cruz is an increase...