Probably the same kind of escalation in Vietnam as we got under Johnson. The use of nuclear weapons there exposes Soviet reluctance to reply in kind for anything except a nuclear attack on the USSR. The USSR has to militarize in Eastern Europe to prevent the satellites there from breaking away
He's the Republican Jimmy Carter. Congress passes 70's end of the imperial presidency legislation to force end to 'republican' war in Indochina. Goldwater obeys instead of finding end runs like Nixon - he's a strict construction limited government type - he lambasts them in the press but follows the law. He's ignored domestically. H3 is elected withlarge demo majorities in 68 and begins great society without burden of large foreign war and without much of LBJ's hubris.
1972 - HHH
1976 - Henry Jackson of Washington
1980 - Bush , GOP, - democratic economics would fail to handle
even a watered down 70's economic crisis
1984 - Bush
1988 - Brown
1992 - Brown
1996 - Dole
GOP is weaker, the Reagan Democrats fewer.