1968 Democratic Party presidential primaries
From March to July 1968, Democratic Party voters elected delegates to the 1968 Democratic National Convention for the purpose of selecting the party's nominee for President in the upcoming election. After an inconclusive and tumultuous campaign marred by the assassination of Robert F. Kennedy, incumbent Vice President Hubert Humphrey was nominated at the 1968 Democratic National Convention held from August 26 to August 29, 1968, in Chicago, Illinois. The primary season began with incumbent President Lyndon B. Johnson expected to win re-nomination for a second consecutive election, despite low approval ratings following the Tet Offensive in January 1968. His only significant challenger was Eugene McCarthy, an anti-war Senator from Minnesota. After McCarthy nearly won the New Hampshire primary, Senator Robert F. Kennedy, another critic of the war and the brother of the late President John F. Kennedy, entered the race. Johnson soon announced that he would not campaign for re-election. In April, Vice President Hubert H. Humphrey joined the race as the establishment candidate; he did not criticize the administration's conduct of the war and avoided the popular contests for delegates. McCarthy and Kennedy traded primary victories while Humphrey collected delegates through the closed caucus and convention systems in place