Unpopular only to establishment types and socialists.  Half the country absolutely loves the guy.
Personally loving the show as we have become so used to incompetent, dishonest, power hungry slugs he is a refreshing change.  Despite what the media continually tells you he is probably the most qualified of all to run what amounts to the biggest business in the world.  Social engineers and Santa Claus wannabees have sunk our society for 60 years.