Dear SoothingDave,
Actually, if I recall correctly, President Logan was originally President Keeler's Vice President. Keeler came after the first President Palmer (if I recall correctly, I think that President Keeler defeated President Palmer in the latter's bid for re-election, but I'm fuzzy on that), but was killed off toward the beginning of Season Four, with Vice President Logan ascending to the presidency as a result.
sitetest
Yep, we've sorted all that out. Keep reading.