[gilleain]

In the 2000, Bush v Gore election the result was contested afterwards when there was some doubt over who carried Florida and it came down to some hundreds of votes.

Trump is claiming in advance that he will "have to see" whether he will accept the result or not. I think that's quite different.

[advantark2]

With the Bush v Gore election, nothing like it had happened before. Of course he wouldn't contest it beforehand. Now there has been a history of it happening. It definitely makes more sense to hesitate now.