He won the popular vote in the States that mattered.
Zerohedge had a great analysis of the popular vote.
Obama won 6 states by a combined margin of 6.7 million votes
Trump won 44 states by a margin of 6.1 million votes
His theory is that many Republicans in NY, California, Illinois, NJ, Maryland and Washington don’t bother voting because their votes don’t mean anything.
Every state should follow Maine and Nebraska’s rules, and split the electoral vote so that Republican voters in blue states are not disenfranchised.
http://www.zerohedge.com/news/2016-11-14/popular-vote-reality-check