Only Reps can stop Kavanaugh from being confirmed. They are either the solution or part of the problem. The Dems always stay united when it comes to the big issues. They are a monolith. They are also the enemy.
A failure to confirm Kavanaugh will depress GOP turnout big time. The Reps will appear weak, divided, and feckless. Loyalty begets loyalty.
Well put, said it better than I did.