AHC: Make the 1972 Presidential Election a Clean Sweep

The United States Presidential election of 1972 was, in terms of electoral votes, one on the most lop-sided elections of modern times with only Massachusetts and Washington D.C. going the other way. Your challenge, should you choose to accept it, is to have Nixon win all fifty states and the District of Columbia. Massachusetts doesn't seem completely impossible since it would require a switch of around 110,000 votes, the District however is much more difficult.
 
You could get Nixon to win Massachusett's with some campaign based PoD's but short McGovern turning out to be a necrophiliac pedophile no way is Nixon winning D.C.
 
Maybe have those on the left who were annoyed that McGovern had 'sold out' on social issues for instance at the convention - put up their own slate of electors ('DC Democrats') which splits the vote enough to allow Nixon to get DC with a small plurality?
 
Does butterflying away the (OTL) 23rd Amendment, and having everything continue more or less the same from there count?
 
A pro statehood 3rd party takes away a huge chunk of the Dems vote
Maybe have those on the left who were annoyed that McGovern had 'sold out' on social issues for instance at the convention - put up their own slate of electors ('DC Democrats') which splits the vote enough to allow Nixon to get DC with a small plurality?
This wouldn't work; even if the third party took half of McGovern's vote, he'd still beat Nixon. Even if two third party candidates ran and split McGovern's share of the vote equally into thirds, Nixon still wouldn't win. If three third party candidates won, and McGovern's vote was split into fourths, then Nixon would narrowly win by a 2 point margin. That's the level of crazy high margins of victory we're dealing with.
 
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