The post-WWII Democratic Party squandered away their incumbency four times over supposedly foreign menaces.
Who lost China? Vote GOP to beat the Commies! (1952)
We can't lose Vietnam! Stay the course! (1968)
We can't be weak against the Islamo-fascists! Vote Reagan! (1980)
We can't let the Palestinians get away with fighting back against ethnic cleansing! Keep sending Israel money and weapons! (2024)
Achievements that Dems couldn't capitalize to maintain their incumbencies:
HST integrating the US Armed Forces and establishing the National Security Council (NSC).
The Great Society accomplishment of LBJ and JFK's Space Race.
Jimmy Carter pardoning Vietnam War draft dodgers, returning the Panama Canal to its people, the Camp David Accords.
Joe Biden ousting Dummkopf Trumpf in 2020, America's first black SECDEF, the massive infrastructure program, expanding the VA, helping Ukraine.
Squandered.
"There's a Red, under my bed.
And a little yellow man in my head."