The filibuster becomes the Republicans' weapon of choice in judicial confirmations.
Political realignment, especially in the South, takes place earlier. Movement conservatives take over Republican Party organizations in numerous states.
The Republicans win big in the 1970 midterms.
Ronald Reagan,starting his second term as governor of California, is the heavy favorite to win the GOP nomination in 1972.
President Humphrey is challenged for re-nomination (by George McGovern, perhaps) over the military draft.