Barack Obama was the best US president since Ronald Reagan, but he's got nothing on Abraham Lincoln. That's the takeaway from a C-SPAN survey of 91 historians who helped rank the best presidents in US history based on 10 criteria, including administrative skill, moral authority, crisis leadership, and pursuit of equal justice, per Time. Whereas Obama faltered in international relations, he scored high in managing the economy and public persuasion, coming in at the 12th spot overall, an "impressive" achievement for his first appearance in the survey, one historian tells CNN. The first 11: