What effect did the Tet Offensive in Vietnam on the war?

Americans began to wonder if the could win the war

While the US Military killed thousands of communists invaders from North Vietnam and stopped the communist offensive dead in it's tracks, the US public seeing the battle on TV, at a time when LBJ and Gen. Westmoreland was saying; 'Peace is at hand', became divided over the war. Clark Clifford replaced Sec. of Defence Robert McNamara, and Clark Clifford recommended pulling out of South Vietnam. Walter Cronkite, respected CBS reporter, recommended pulling out as well. LBJ announced there would be peace talks with North Vietnam in Paris and he would not run for a second term.