Seriously, think about it.
The most recent, the last, time a Democrat succeeded a Democrat president was in 1963, when Lyndon Johnson took over after John Kennedy was assassinated.
That was fifty-three years before this most-recent election.
And the time before that, that a Democrat succeeded a Democrat president was in 1945, when Harry Truman took over after Franklin Roosevelt died in his sleep.
Now, Demonic Underwear mentioned "the last time a Democrat president succeeded a Democrat president in a national election."
Geezuz gawd, one has to go clear way back to 1837 for that, when Martin van Buren won the presidency as his predecessor Andrew Jackson retired.
It seems it's almost never happened, that a Democrat succeeded another Democrat.