The timing is clearly political, and will probably result in all accusers of these types of crimes having less credibility.

The claim in itself is not credible IMO, it is missing too many details and it doesn’t look like it can be corroborated.

I think there will be pressure on a small number of democrats to vote for him who represent “red” (leaning) states.

I think this might have had a bigger chance of derailing the nomination if it didn’t come out at a clearly politically motivated time.