The Siena Research Institute asked 238 presidential scholars to rank each president from 1 (best) to worst (43) in nineteen different categories, plus one overall ranking. A complete list of the rankings is here. Before peering inside the numbers, let us remind ourselves that the presidential “scholars” Siena polled are academic, intellectual scholars, which are, of course, the best kind of scholars to have. So, with this in mind, who do you think came in worst? No, it wasn’t George W Bush—he was fifth from the bottom—it was Democrat Andrew Johnson, a man who, it must be admitted, would make...