Lyndon B. JohnsonOn March 31, 1968, incumbent U.S. president Lyndon B. Johnson made a surprise announcement during a televised address to the nation that began around 9 p.m., declaring that he would not seek re-election for another term and was withdrawing from the 1968 United States presidential election. Johnson stated: "I shall not seek, and I will not accept, the nomination of my party for another term as your president."
At first, Johnson's only significant challenger in the 1968 Democratic Party presidential primaries was Eugene McCarthy, an anti-war U.S. senator from Minnesota. Johnson's announcement that he himself would drop out of the race came after McCarthy nearly won the New Hampshire primary and Senator Robert F. Kennedy, another critic of the war and the brother of the late president John F. Kennedy, entered the race. Johnson's decision and the assassination of Kennedy opened the door for Vice President Hubert Humphrey to become the Democratic Party's nominee. The 1968 Democratic National Convention, held in Chicago, was marked by significant protests and clashes between demonstrators and police, reflecting the deep divisions within the nation.