Hunting the President: Threats, Plots and Assassination Attempts, Part 2: JFK

The only president to be assassinated in the last century was John F. Kennedy. What caused this failure in the Secret Service's typical protection procedures? Was it a perfect storm of bad luck, a lapse in judgement in the protection detail, or something far more nefarious, as conspiracy theorists have insisted for five decades? See omnystudio.com/listener for privacy information.