WI Ronald Reagan Was Elected US President In 1968?

I suspect that if Reagan got elected and escalated the Vietnam war then things would go badly. He can't really win unless he not on invades N Vietnam but successfully occupies it. Which seems extremely unlikely given the probable objections inside the US and the western world and the support Russia and China would give the communists. Plus from what I understand of the American military attitude of the time, overwhelmingly concerned with firepower and loss ratios rather than hearts and minds I can see it becoming an increasingly costly and divisive quagmire. This might not occur in a Reagan 1st term, especially if its some time before he invades Vietnam, but I could see the war being the key issue by 1976 if not 1972. Don't forget the Tet offensive has already occurred and a general loss of satisfaction on the war in the US and probably more importantly amongst the conscripted US troops.

As such, especially if he invades the north I could see Reagan being discredited and increasingly unpopular in the US along with the party as a whole. You could see another Carter or someone similar winning in 76 if not 72.