ProdigalHorn
10,000+ Posts
By fighting Gorsuch, they keep their cred.
I think this may just be "pick your poison" thing at this point. If they give in and don't filibuster, then their whacko base feels betrayed, the moderates start thinking that cooperation might help their re-election prospects and they feel as if they've given up their trump card to ever oppose a nominee again. They've somehow managed to paint Gorsuch as a monster to the base, and they've gone too far to now say "OK we'll accept him."
They've put themselves in a position where all they can do is force McConnell to play his hand so they can scream injustice and try to win votes in the midterms based on that. The dem playbook at this point has one page: make the base madder and shriller and hope that they become so furious that they either undergo mitosis and split into multiple mad voters, or at least make it impossible for anyone to have a civil discussion about an issue which might make them look bad.