Warren Harding - 100 years

[Sir Mohamed]

There's really no way to argue he's a bottom 10 president. At bare minimum, he's clearly not as bad as Fillmore, Pierce, Buchanan, Andrew Johnson, Hoover, Bush II, and Trump, and depending on your ideological persuasion, it's really hard to imagine someone who can't come up with 3 more presidents who they consider more harmful than Harding, even if there might be some disagreement as to who that should be.

Yup, it's quite possible Coolidge did more harm in the end than Harding.