was this map ever a realistic possibility in 1968?

[SingingAnalyst]

Awarding all states with less than a 2.5% margin to Humphrey yields the following map:

Humphrey 261
Nixon 232
Wallace 45

With Humphrey winning a plurality of both the PV and EVs, Wallace would be under enormous pressure. Had he instructed his electors to vote for Nixon, the fallout would probably have been worse than 2000. The best case would be for HHH to win a majority of EVs, but that seems unlikely in retrospect.