I thought fair to give the benefit of the doubt, and from what I've read - they complainant had gone to the FBI first, who had decided they couldn't investigate, likely due to time elapsed and lack of corroborating witnesses - and so I thought it fair that if the FBI themselves had decided not to investigate, that there shouldn't be political pressure to do so.
However, with more accusations emerging, some with corroborating witnesses, I think his nominations is becoming untenable. Again, I don't think the political parties should be directing the FBI etc. to investigate, but if they are choosing to investigate then that is their jurisdiction as such and will be interesting to see what they find.