Rachel Mitchel was that lady that was interviewing Ford for the republicans. During her questioning she would regularly point out that Ford would submit a statement and a few days later she would change the details. One of those instances was her polygraph.
She took the polygraph, passed it, and then later on changed details of her answers and testimony from that polygraph test. (Very suspicious. How do you change details of something that you supposedly already told the truth about?)
What Rachel Mitchel showed was that Ford has repeatedly changed her story throughout this process. She also showed during her brief questioning of Kavanaugh that he has kept the same stance and story from day one.
The public may not understand this significance, but Rachel Mitchel has essentially proven Kavanaughs innocence in the eyes of the senate. Clearly Ford's statements aren't credible and to make it worse all of her supposed witnesses Denied her claims.
Kavanaugh will go to a vote for Supreme Court Justice.