No, they do have a vision, and leadership helps them with it, for their own selfish reasons.
They just want to stay in power.
And that's the vision right there in plain English.
Ask yourself this: Did Orrin Hatch really believe that Migual Estrada was being blocked because of racism against Hispanics, or was he just saying so? Do all these Senators really believe that a nominee can't be opposed on political grounds, or are they just saying so? There are only two options. They are either really stupid or they are frauds, and I just don't think they are that stupid. I think you have to have some sort of skill to be a Senator. You have to be a silver tongued liar, basically.
OK, I see your point. But I think it is possible to get leadership with a good vision. Call me hopelessly optimistic.