Lyndon B. Johnson, 1965: The United States Marine Band ... Barack Obama, 2013: Beyoncé performed the national anthem and later said she had lip-synced to a taped track. James Taylor also sang.

In March 1968, President Lyndon B. Johnson was nearly 40 minutes into a speech on the Vietnam War when he closed with a stunning announcement: He would not seek another term. From the Oval Office ...