Would LBJ have lost the presidential primary in New Hampshire without the effects of Tet? His poll numbers dropped steeply

Would LBJ have withdrawn from the race for the presidency on March 1st or called a halt to bombing the enemy in order to seek a negotiated settlement? Johnson had called for a military victory in Vietnam, officially, only two and half years earlier.

Nixon entered office in January 1969 and started withdrawing troops by late summer. Richard Nixon never had any intention of winning the Vietnam War, though he'd liked to have seen GVN scrape by with some kind of independence, it was not a vital US national interest to him if it did (even less to Kissinger). Invading Cambodia or bombing North Vietnam was never used by Nixon to pursue a military victory but in context of gaining the upper hand in a negotiated settlement with Hanoi and triangulating secret diplomacy with Moscow and opening relations with Peking.,

Looks like the will to to continue fighting took a severe dent at least