Improve Nixon's reputation, with one caveat...

That would undo all of his work building ties with China.

Yeah, and I would need some convincing to think that Nixon would be any more likely to side with Vietnam against China and Cambodia than were Carter, Brzezinski, Reagan, Thatcher, and GHW Bush.
 
Maybe he tries to redeem himself with humanitarian work? If he becomes the same kind of ex-president Carter has been in OTL, he isn't associated primarily with Watergate.
 
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