Yes.
A dozen or so traitors like him convinced America that the Vietnam war was "unwinnable" at the exact time North Vietnam was huddling after their failure of a Tet Offensive wondering if America would demand an unconditional surrender, or would allow a condition or two. Like their survival.
Just about a dozen. Robert Mueller, Jane Fonda, Dan Rather, John Kerry, Walter Cronkite; just a few, and America "lost" the Vietnam War.