When Lyndon Johnson took the United States into large-scale war in Vietnam in 1965, he did so despite deep misgivings on the part of numerous close associates, including his vice president and senior Senate Democrats, as well as key allied governments. Johnson himself frequently expressed doubts about the prospects in the struggle, even with the commitment of major US combat troops and heavy air power. Yet he took the plunge, despite the fact that some part of him suspected – correctly – that the war would ultimately be his undoing. Why he did so is harder to explain than is often suggested, but it’s not inexplicable. At each step, escalation represented the path of least political resistance for him. Thus although Johnson may have been a doubting warrior, he was also a determined one, from his first day in office to his last. He stayed the course even as domestic opposition grew in 1967 and 1968, and even as his principal subordinate on the war, Secretary of Defense Robert McNamara, grew disillusioned. In January 1969, Johnson left Washington, a man broken by a war he didn’t want but felt compelled to wage.