Posted today for no particular reason except...oh, just because.
The short version is that bandleader Vic Caesar wrote and recorded that little ditty, strictly out of the goodness of his heart, for the Nixon campaign in 1968, after which it was more or less forgotten. Then, as Watergate led inexorably to the Jowled One's resignation, some wiseguy at Capitol Records remembered it and acquired the rights.
I actually had a promo 45 just like the one in the photo, which I used to play for unsuspecting friends when they dropped by my digs. Lost it at some point, but fortunately the recording re-surfaced on the soundtrack to the Clifford Irving bio-pic The Hoax in 2006.
I still think it's the most genuinely psychedelic piece of music in history, BTW.