Corroborating evidence might be a calendar, produced by the accused, demonstrating he attended a party drinking with the exact people Ford alleged. Unfortunately, the partisan prosecutor barely scratched that surface.
Some of the same people were listed. Others weren’t. It’s unclear if Ford was at that party.
It’s unsurprising that Kavanaugh hung out with his friends...and that he drank with them. Is that corroboration that Ford was probably there and he probably sexually assaulted her? Of course not.