<Li> January 30, 1968--Tet Offensive was launched and resulted in much higher casualties and changed perceptions . The optimistic assessments made prior to the offensive by the administration and the Pentagon came under heavy criticism and ridicule as the "credibility gap" that had opened in 1967 widened into a chasm . </Li> <Li> February--Gallup poll showed 35% approved of Johnson's handling of the war; 50% disapproved; the rest, no opinion . (NYT, 2 / 14 / 68) In another poll that month, 23% of Americans defined themselves as "doves" and 61% "hawks ." </Li> <Li> March 12--anti-war candidate Eugene McCarthy received more votes than expected in the New Hampshire primary, leading to more expressions of opposition against the war . McCarthy urged his supporters to exchange the' unkempt look' rapidly becoming fashionable among war opponents for a more clean - cut style to in order not to scare voters . These were known as "Clean Genes ." </Li> <Li> March 16--Robert Kennedy joined the race for the US Presidency as an anti-war candidate . He was shot and killed on June 5, the morning after he won a decisive victory over McCarthy in the Democratic primary in California . </Li>

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