Well since many here believe there's absolutely no difference between Republicans and Democrats, I guess it will pass the Senate 100 to 0.
I get and understand your point, but that is not how it works. What they do is work out between them who is going to vote which way. I was proud of how the Pubs voted on Obamacare, but that is a rare situation.
Normally they negotiate and know what the vote is going to be and who is going to vote which way for their political self-interest. That is what all the deals and pork is all about.
It is in all of their interests to work with each other, more or less, and to keep the game going. I'll vote for this if you will vote for that. Otherwise the Republicans would have no threat to extort favors.
You actually make a very good point in that if there was a vote like that then the gig would be up. They have to keep it respectable. But in the end, the Democrats almost always get whatever they want. No matter what.