WI Nixon forgoes '68 run?

No. Coming back to the OP, I think that all of these scenarios are fairly plausible. I can't see Nixon committing suicide if he loses, but the pursuit of the presidency had become a lifelong quest. This was the last window: 1972 will be facing an incumbent and Nixon'll be 68 when he leaves in 1981 if he wins twice, which is unlikely IMO. Hubert has two more cycles. Bobby has three. Nixon has none.

I think the Reagan v. Kennedy scenario is most likely if Nixon stays out, followed by Reagan v. Humphrey. If Kennedy wins, Reagan succeeds him in 1976, and vice-versa. Regardless of who wins when, the 70s and the first half of the 80s will be viewed differently than OTL.
 
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