I found that odd too. Kavanaugh was clearly to Amy Coney Barrett's LEFT, but they went ballistic with Kavanaugh's nomination and blew their entire wad opposing him tooth and nail. Why they were so upset about an mundane establishment hack Anthony Kennedy clerk replacing Anthony Kennedy is beyond me. I expected the RAT opposition to her to be 20X worse and them to blanket the airwaves with ads 24/7 "warning" everyone that ACB is a "far right wing religious nutcase" who thinks the Virgin Mary tells her to ban abortion, or some character assassination theme along those lines. By the time they got done with her, I expected the public to see her as the looney mom in Carrie.
As it was, the ACB nomination was just the RATS bitching about it quietly and it sailing thru overnight.
Barrett was closer to the election and female. So the Dems backed off a little. They had the Chicom flu and Zuckerbergs billions backing them up. So they played it a bit safe, IMO.