I was browsing eBay the other day and ran across an anti-Reagan political pin that said, “Harding. Coolidge. Hoover. Reagan. Who says you have to be smart to be President?” The attempt was to link Reagan with the Republican Presidents of the 1920s, inferring that Harding, Coolidge, and Hoover were incompetent and caused the Great Depression, and that Reagan, a graduate of Eureka College, would follow their example and bring on another economic calamity. It’s an oft-used play in the Democratic playbook: Tie every Republican to the dummies in the ‘20s.