Rand Paul on the one big difference between him and Trump

Less than two weeks before the Iowa Caucuses, Sen. Rand Paul touted his ground game and also took time to criticize current front-runner real estate developer Donald Trump. “He’s spent most of his life as a progressive Democrat,” he said in an interview with Gwen Ifill today, adding, “really, there are a lot of things about Donald Trump that aren’t conservative.” Trump led the Republican primary field with 33 percent in a national NBC/Wall Street Journal poll released earlier this month. But Paul discounts polls saying they don't reach college students, which he's banking on to energize his campaign. Watch the full interview on PBS NewsHour.