None of the Democrats asked Ford any substantial question that would assess the credibility of her or what she is saying, and they for the most part were questioning Kavanaugh about things like his yearbook and drinking habits, in attempts to further smear him, and his friends from High School.
Digging into one person's past would be "assessing credibility", but digging into another person's past is "smear"? Republicans didn't ask Ford
any questions at all choosing instead to delegate to Rachel Mitchell, but they pushed Mitchell aside when she started digging into Kavanaugh's calendar.
( conspiracy theory skipped )
Kavanaugh dug most of his hole himself. Democrats may have handed him a shovel a couple of times but that's about it. He didn't have to lie about his yearbook entries, he decided to do that on his own. Unless you're saying that Clintons created Urban Dictionary to get back at Kavanaugh.