If that had happened Leahy would have gone back to all the leftist donors and say, You wanted that person's nomination killed and I did it. Could you send more money as a reward for a job well done?"
If on the other hand Leahy doesn't have the votes, he rants and raves and make all sorts the noise he can. Then the person gets confirmed. Leahy orders copies of the congressional record containing all his rants and raves and sends them to all the leftist donors and says "You wanted that person's nomination killed and I did all we could to stop it(see enclosed rants and raves). I just barely failed. I might have succeeded if you had sent me more money. Could you send me more money?"