First problem: could anybody really know that at the time? Second problem: abortion, which seems to be what people vote on most of the time.
Would Gore really have been different from Bush on foreign policy? Would he really have avoided the financial crash? And would he have been as gung ho on climate change as he was after he'd been out of office for a few years and needed a new grift?
All of those choices sucked, hence our dilemma.