Lyndon B. Johnson became the 36th President of the United States after the assassination of John F. Kennedy in 1963; Johnson ran in his own right in 1964, ... (Getty Images) Image 8 of 8.

Getty Images. On March 31, 1968, at 9:00 p.m., Lyndon B. Johnson sat behind the large wooden desk he had used since his days in the Senate and addressed the American people from the Oval Office.

UniversalImagesGroup // Getty Images. Lyndon B. Johnson in talks with Civil Rights leaders in the White House, including Martin Luther King, Jr. By Christmas 1963, ...

Biden's Democratic critics have compared his achievements to that of President Lyndon B. Johnson, ... CBS Photo Archive/CBS via Getty Images/CBS via Getty Images hide caption.

President Lyndon B. Johnson federalized the National Guard in 1965, calling on troops to protect civil rights advocates who were marching from Selma, ... Daily Express/Hulton Archive/Getty Images.

President Lyndon B. Johnson federalized the National Guard in 1965, calling on troops to protect civil rights advocates who were marching from Selma, Ala., ... AFP / via Getty Images / via Getty ...