A defeated president has 0% chances to be elected again later.
Grover Cleveland?
I thought his paragraph began with
A Vice-President that succeeds to a dead or resigning President has 
- 44,4% chances to be reelected
- 44,4% chances not to run
- 11,1% chances to be defeated
In this case
A reelected president has :
- 50% chances for his party to keep the White House
- 50% chances for his party to lose the White House
When a president doesn't run, his party has 100% chances to lose the White House.
A defeated president has 0% chances to be elected again later.
The preceding statements have no association with the latter statistically. Cleveland was defeated, and was elected later, so the 0% chance cannot possibly be true.
