Who is the most popular president in the world?

Pollsters do occasionally take polls to ask that question. A large number of people know only the presidents from their own lifetime so the most recent presidents win in these polls. Democrats name Obama or Clinton. Republicans pick Reagan. Moving back into history a bit, the names that consistently vie for top place among all American presidents are Washington, Lincoln , F. D.R, Teddy Roosevelt, Harry Truman and J.F.K. Interestingly, polls taken among history professors and other experts in the field usually have vastly differing views of the top ten presidents, but they are curiously alike in naming the worst candidates, and the name at the bottom of most lists is James Buchanan.