Presidential protection is no joke. If a president even enters your city, expect noticeable traffic delays created sheerly by their presence - and that doesn't even scratch the surface of the intense security in place at any event with the leader of the free world.
The Secret Service was founded in 1865 to prevent counterfeiting of US currency, and started protecting the country's presidents after William McKinley's life was terminated in 1901. The organization has implemented code names to hide the president's identity only since Harry Truman's administration. Some presidents received very cool, apt code names, while others arguably did not.