Real Clear Politics is an aggregate of polling numbers which means Trump’s real popularity is likely higher once you throw out all the liberal bias.
Seriously, what more could Trump do in three years? The economy has taken off like a rocket, the border wall is getting built despite active resistance, we’re out of some really bad trade agreements and the Paris climate deal, many conservative judges have been added to federal courts at all levels, our enemies are embarrassing themselves right and left... Nitpick if you want but this has been an awesome first term by any reasonable measure - and I think the word “awesome” is way overused. Trump’s been YUUUUUGE!
Certain polls simply have no credibility. CNN had Clinton up something like 10 points right before the election. I didn’t bother to check but I assume they are part of the average.