5 World Events Could Swing U.S. Election

In January, the Pew Research Center concluded that the American public is more concerned with domestic policy than at any point in the past 15 years.

But every politician lives in fear of that 3 a.m. phone call that can upend the best-laid campaign plans. Here are five global events that could send the U.S. election careening along a very different path than the one it's traveling down today.