I have thus far tried to stay out of this thread. And I am only wading in with a couple toes.
Anyone here listen to Malcolm Gladwell's podcast Revisionist History? Season 3, Episodes 3 and 4, are fascinating listens. They relate to memory, including a very enlightening explanation of how Brian Williams probably was not a liar when he claimed he was in a helicopter that took gunfire over Iraq. Sure, he was wrong in his description of what happened, but not a liar.
I am not suggesting that Professor Ford's memory is inaccurate, nor am I suggesting that Kavanaugh would be lying if he claims he was not at the party and others claim that he was.
Rather, I am suggesting that memory is nowhere near is infallible as we think, even with respect some of the more significant events in our lives.
And therein lies the problem. This is not a simple he said/she said situation, particularly after 30+ years. It would be wrong to assume that either Professor Ford or Judge Kavanaugh is lying simply because their stories (whatever those turn out to be) are contradictory.
So how should the Senate deal with the issue? Well, other than treating each of them respectfully and not portraying either as a liar (unless there is more evidence than just their respective testimony), I have no idea.
http://revisionisthistory.com/episodes/23-a-polite-word-for-liar-memory-part-1
http://revisionisthistory.com/episodes/24-free-brian-williams