在新罕布什尔州小学的惊人成绩和罗伯特肯尼迪在比赛中的进入之后，林登约翰逊为自己的计划感到痛苦。在1968年3月31日的一个星期天晚上，约翰逊在电视上向全国发表讲话，表面上是为了谈论越南局势。在首次宣布停止美国在越南的爆炸事件后，约翰逊宣布他不会在那一年寻求民主党提名，从而震惊了美国和全世界。约翰逊的决定涉及许多因素。尊敬的记者沃尔特·克朗凯特（Walter Cronkite）在一次值得关注的广播中回顾了最近在越南举行的春节攻势报告，他认为战争是无法取胜的。根据一些报道，约翰逊认为Cronkite代表了美国主流的主流观点。约翰逊对罗伯特肯尼迪也有长期的敌意，并且不喜欢与他竞选提名。肯尼迪的竞选活动已经开始了，在加利福尼亚州和俄勒冈州出现的人群激动不已。在约翰逊演讲前几天，肯尼迪在洛杉矶瓦茨附近的一个街角讲话时，被全黑人群欢呼。对抗更年轻，更有活力的肯尼迪显然没有吸引约翰逊。约翰逊惊人决定的另一个因素似乎是他的健康状况。在照片中，他看起来对总统职位的压力感到厌倦。他的妻子和家人很可能会鼓励他开始退出政治生活。在约翰逊令人惊讶的宣布后不到一个星期，这个国家被马丁路德金博士的暗杀震惊了。在田纳西州的孟菲斯，King于1968年4月4日晚上走出酒店的阳台，被一名狙击手枪杀。在King被谋杀之后的几天里，华盛顿特区和其他美国城市爆发了骚乱。在King被谋杀之后的动荡中，民主党的竞争仍在继续。肯尼迪和麦卡锡在最初的奖项中加入了少数几个初选，加州小学就此接近了。 1968年6月4日，罗伯特肯尼迪在加利福尼亚赢得民主党初选。那天晚上他和支持者一起庆祝。离开酒店宴会厅后，一名刺客走近酒店的厨房，并将他射中脑袋。肯尼迪受了致命的伤，并在25小时后死亡。他的尸体被送回纽约市，在圣帕特里克大教堂举行葬礼。由于他的尸体被火车带到华盛顿，在阿灵顿国家公墓的兄弟坟墓附近埋葬，成千上万的哀悼者排成了铁轨。民主党的竞选似乎结束了。由于初选并不像晚年那样重要，党内提名人将由党内人士选出。似乎约翰逊的副总统休伯特·汉弗莱（Hubert Humphrey）在年度开始时没有被认为是候选人，他们将锁定民主党的提名。
After an amazing achievement in New Hampshire Elementary School and Robert Kennedy’s entry into the game, Lyndon Johnson was suffering for his plan. On a Sunday night on March 31, 1968, Johnson spoke to the nation on television, ostensibly to talk about the situation in Vietnam. After the first announcement of the cessation of the US bombing in Vietnam, Johnson announced that he would not seek a Democratic nomination in that year, thus shocking the United States and the world. Johnson’s decision involves many factors. Dear journalist Walter Cronkite reviewed the recent Spring Festival offensive report in Vietnam on a broadcast that deserves attention. He believes that war cannot be won. According to some reports, Johnson believes that Cronkite represents the mainstream mainstream view of the United States. Johnson also has long-term hostility to Robert Kennedy and does not like to campaign for nominations with him. Kennedy’s campaign has begun, and the crowds in California and Oregon are thrilled. A few days before Johnson’s speech, Kennedy was cheered by the whole black crowd when he spoke at a corner near Watts, Los Angeles. Against Kennedy, who is younger and more energetic, apparently did not attract Johnson. Another factor that Johnson made an astonishing decision seemed to be his health. In the photo, he seems tired of the pressure on the presidential position. His wife and family are likely to encourage him to start withdrawing from political life. Less than a week after Johnson’s surprising announcement, the country was shocked by the assassination of Dr. Martin Luther King. In Memphis, Tennessee, King walked out of the hotel’s balcony on the evening of April 4, 1968, and was shot by a sniper. In the days following King’s murder, riots broke out in Washington, DC, and other US cities. In the turmoil after King was murdered, the competition of the Democratic Party continued. Kennedy and McCarthy joined a few primary elections in the initial awards, and California Elementary School was close. On June 4, 1968, Robert Kennedy won the Democratic primary in California. He celebrated with supporters that night. After leaving the hotel ballroom, an assassin approached the hotel’s kitchen and shot him in the head. Kennedy was fatally wounded and died 25 hours later. His body was sent back to New York City for a funeral at St. Patrick’s Cathedral. As his body was taken to Washington by train, buried near the brotherly tomb of the Arlington National Cemetery, thousands of mourners were lined up. The Democratic Party’s campaign seems to be over. Since the primary election is not as important as the later years, the nominees in the party will be elected by the party. It seems that Hudson Humphrey, the vice president of Johnson, was not considered a candidate at the beginning of the year and they would lock in the nomination of the Democratic Party.