Ike and Kennedy also have some responsibility. Was it not Kennedy who approved the assination of the President of South Vietnam? However, it was LBJ who dramatically increased troop numbers and I believe McNamara who thought the war "unwinable". Once Nixon was elected the moonbats took over the Democratic party and engineered the surrender.
If I'm correct (and I need to verify this), Eisenhower supplied only weapons and logistical support to the French.
Eisenhower hadn't yet committed US troops to act as advisors for the South Vietnamese army - or did he? Didn't the use of US advisors start with Kennedy?
Hell, Truman bears some responsibility, too, for not giving Uncle Ho his due after fighting the Japs along with us.
Actually, we can go back to Woodrow Wilson for Vietnam. Ho Chi Minh tried to speak with Wilson at the peace negotiations for World War I. Ho Chi Minh was a fan of the west at that time, and wanted to get Wilson's help to get France out of Vietnam, then French Indochina. Wilson not only refused to speak with him, but insulted him as well. Ho Chi Minh sought help from the Communists instead.