Presidential watchers and historians are in a holding pattern waiting to learn about the location of the Obama library. The Barack Obama Foundation is waiting for the results of the April 7 Mayoral run-off to announce whether Chicago, where the President has deep political and personal roots, will land the deal. And while some Chicagoans say it seems impossible to imagine it anywhere else, some experts say a presidential library is not the economic or cultural prize that cities claim it is. Anthony Clark is a former legislative aide and speechwriter and author of The Last Campaign: How Presidents Rewrite History, Run for Posterity & Enshrine Their Legacies. He says that it’s not about the flashy exhibits, but the approval rating when he leaves office. Clark walks us through some of the more popular presidential libraries. (Flickr/acaben)