the disastrous results, and he sought to build on that in the 1966 Congressional elections. He campaigned for many Republicans, seeking to regain seats lost in the Johnson landslide, and received credit for helping the Republicans make major gains that year. 1968 presidential campaign At the end of 1967, Nixon told his family he planned to run for president a second time. Pat Nixon did not always enjoy public life, being embarrassed, for example, by the need to reveal how little the family owned in the Checkers speech. She still managed to be supportive of her husband's ambitions. Nixon believed that with the Democrats torn over the issue of the Vietnam War, a Republican had a good chance of winning, although he expected the election to be as close as in 1960. An exceptionally tumultuous primary election season began as the Tet Offensive was launched in January 1968. President Johnson withdrew as a candidate in March, after an unexpectedly poor showing in the New Hampshire primary. In June, Senator Robert F. Kennedy, a Democratic candidate, was assassinated just moments after his victory in the California primary. On the Republican side, Nixon's main opposition was Michigan Governor George Romney, though New York Governor Nelson Rockefeller and California Governor Ronald Reagan each hoped to be nominated in a brokered convention. Nixon secured the nomination on the first ballot. He selected Maryland Governor Spiro Agnew as his running mate, a choice which Nixon believed would unite the party, appealing both to Northern moderates and to Southerners disaffected with the Democrats. Nixon's Democratic opponent in the general election was Vice President Hubert Humphrey, who was nominated at a convention marked by violent protests. Throughout the campaign, Nixon portrayed himself as a figure of stability during this period of national unrest and upheaval. He appealed to what he later called the "silent majority" of socially conservative Americans who disliked the hippie counterculture and the anti-war demonstrators. Agnew became an increasingly vocal critic of these groups, solidifying Nixon's position with the right. Nixon waged a prominent television advertising campaign, meeting with supporters in front of cameras. He stressed that the crime rate was too high, and attacked what he perceived as a surrender of the United States' nuclear superiority by the Democrats. Nixon promised "peace with honor" in the Vietnam War and proclaimed that "new leadership will end the war and win the peace in the