It is possible to view this as an isolated event or a trend. Coming on the heels of BREXIT this is a trend.
The attempts at building an interconnected globalised world are beginning to fail. A bunch of elites decided to create their own trans-national utopia unchecked by borders and dismissed all criticism as racist or bigoted. The globalisation project has been rejected by a majority of the population. Whether it is for economic reasons or just plain bigotry is something for the sociologists to study and not something I can pontificate on.
Also people seem to care a LOT about immigration and preserving their culture. Instead of patronising these people it's time we tried to understand their concerns and try to assuage them.
There is no genuine leftist alternative. It's a choice between center-right "left" that's sold out to the establishment and the far right.Economists need to stop acting like priests in the medieval ages who justified the existing order . The rural voter who lost his job doesn't care about the theory of comparitive advantage.
If this trend holds this will soon take hold in France and other European nations. This is a return to the world of the 1920s. Not gloom and doom but a much more unstable global order with every country for itself. Not what we need when we face planet scale threats like global warming.
Get out of your bubble.
Hang out more on subreddits you don't agree with.
The divide is bridged one person at a time.
PS - Reposted my comment from another thread as it got flagged. Hope its OK with the mods.
EDIT:
His concession speech seems to indicate that he's beginning to appreciate what he's been entrusted with.