AHC: A McGovern victory in 1972

Lyndon Johnson and Hubert Humphrey decide to come forward and expose Nixon's interference in the Vietnamese peace talks during the previous election, directly accusing the President of treason, also citing the break-in at the Watergate hotel as an attempt to find the documents and hide/destroy them (as has been speculated by some sources, though not confirmed.)

Keep in some of the factors I mentioned above, and McGovern has more than a reasonable chance of winning. All you need is a motivation for Johnson to want Nixon's hide that he didn't have OTL.
 
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