It's not easy eating principles. It's a big thick pill. Blowback is always inevitable when you accuse someone of something. I have a feeling they are now fully justified because the Republicans pushed the Kavanaugh nomination through as if a last minute accusation from 35 years ago (or however long ago it was) is the equivalent of evidence that is unequivocal.
They will certainly raise Kavanaugh, even though it's not remotely equivalent. When someone catches people in hypocrisy, usually the first thing they do is attack someone else to change the subject.
However, when another safe Democrat gets into trouble, they will likely throw him under the bus and claim the moral high-ground again.