With six states still to be called, much about the 2020 election is up in the air. What is clear is that President Trump did far better than most polls suggested he would, as also was the case in 2016. Surveys gave the impression of "an easy win for former Vice President Joe Biden, a Democratic pick-up in the Senate, and gains for the party in the House," as David A. Graham writes at the Atlantic. "Instead, the presidential election is still too close to call, Republicans seem poised to hold the Senate, and the Democratic edge in the House is likely to shrink." So what happened? Click through for some theories.