It might be President Obama's biggest broken promise: closing the prison at Guantanamo Bay.
As a candidate, Obama vowed so many times that he would shutter the prison he called a recruitment tool for terrorists that he himself even noted how often he's promised to do so, in an interview with Steve Kroft shortly after he was elected.
In that interview in November 2008, Kroft asked Obama if he planned to "take early action" to shut down Guantanamo. Obama replied, "Yes."