This time around, the Electoral College gave the win to the Republicans even though the Democrats got more votes. But next time, it could go the other way around.
The Electoral College was intended to keep the power of deciding the presidency OUT of the hands of the people. An handful of elite "Electors" would meet as a "College" to talk among themselves who they thought should win. The Common Man was looked down upon as not having the good sense to decide, but merely to send his betters to do the heavy thinking.
We reject that idea in every other election - so why is it a good idea for the Presidency?
The Electoral College also means that most states aren't worth talking about. California will always vote Democrat so the Republicans there are wasting their time; Texas will always vote Republican so the Democrats there are wasting their time. And in both cases, the candidates ignore them (...except for raising money.) Most of the campaigning in 2016 involved SIX STATES. Isn't that .... stupid?
A National Popular Vote is the only fair way to elect a President.
Amending the Constitution to eliminate the Electoral College is hard but an "Interstate Compact" could solve the problem - without any action by Congress.
Learn more here.