There's a dark history behind Trump's threat to send his followers 'into the polls'

During the first presidential debate, Donald Trump was asked by moderator Chris Wallace if he would “urge" his followers to remain calm during a prolonged vote-counting period after the election, if the winner were unclear. “I am urging my supporters to go into the polls and watch very carefully because that is what has to happen, I am urging them to do it," Trump said. “I hope it's going to be a fair election, and if it's a fair election, I am 100 percent on board, but if I see...