Very. But he got extremely partisan, and coming across as angry was a bad way to show that he's not the kind of guy who would sexually assault someone.
And the fact that he continues to refuse to call for an FBI investigation is really rough for his credibility at the end of the day. In the group of three accusers and the one accused, he's still the only one who isn't eager for the FBI to get involved.
His best bet right now is to hope that the Democrats either come across as bullying, or that they're so taken aback by his emotional testimony that they give the impression that they believe him in an effort to not come across as such.
I'm not sure what Mitchell has in store, but I doubt she really has much to offer for him.