Cooldige, Nixon, Cleveland, John Adams.
Those four two.
You realize, do you not, that Nixon and Adams were philosophically antithetical to Coolidge and Cleveland? Two of the above wanted to decrease the size and scope of the Federal government; two of the above massively expanded it. Care to take a guess as to who did what?
Generally speaking, I find that most admirers of John Adams & Richard Nixon admire them for reasons completely unrelated to the policies that they supported. Of course, that makes posting them in a topic about the most underrated President nonsensical.