Republican presidential candidate Ted Cruz leads Donald Trump by 2 points in a national NBC News/Wall Street Journal poll released Wednesday. Trump had held the top spot in the previous 31 consecutive national polls, according to RealClearPolitics, posting a double-digit lead in all but four. In last month's NBC poll, Trump held a 13-point lead over Cruz. The Texas senator has 28 percent support in the poll, with Trump at 26 percent. Marco Rubio follows, with 17 percent in the poll, which was conducted after Saturday's GOP debate. Cruz also leads Trump by 16 points in a head-to-head match-up. The...