U.S. President Lyndon Johnson passes out some of the 72 pens he used to sign the Civil Rights Bill in Washington on July 2, 1964. From left, standing are, Rep. Roland Libobati (D-Ill.), Rep. Peter Rodino (D-N.J.), Rev. Martin Luther King Jr., Rep. Emmanuel Celler (D-N.Y.) and Whitney Young, executive director of the National Urban League. The relationship between the president and King worsened during the escalation of the Vietnam War. Credit: AP

U.S. President Lyndon Johnson passes out some of the 72 pens he used to sign the Civil Rights Bill in Washington on July 2, 1964. From left, standing are, Rep. Roland Libobati (D-Ill.), Rep. Peter Rodino (D-N.J.), Rev. Martin Luther King Jr., Rep. Emmanuel Celler (D-N.Y.) and Whitney Young, executive director of the National Urban League. The relationship between the president and King worsened during the escalation of the Vietnam War. Credit: AP