The vast majority of historians (over 90 percent) are Democrats/Marxists. Yes, AliBamy was that bad and Biden is even worse.
James Polk is in the top 20... I bet you 99% of americans without google cannot even tell you when he was president or what he actually did...
Consider the case of Dwight D. Eisenhower, the 34th President of the United States (1953-1961), Supreme Allied Commander in Europe during World War II, and a Republican. Funny thing is, by today's standards, Ike would be a flaming liberal, to the Left of all recent serious contenders for the Democratic Party presidential nomination.
The pro business tax cutting dragging his feet on civil rights JFK would be a moderate republican by today's standards and he too is top 10.