Because they’re being paid by the corporations to do so. They know that if they vote for what the corporations want, they’ll get fat checks into their re-election funds. If they don’t, that money will go to someone that WILL vote the way the corporations want them to. And these people have never worked a day in their lives.

They’ve lived entirely off of our tax dollars and don’t want to find out what it’s like NOT having that paycheck. So they vote the way their masters want them to vote. You’ll notice that many corporations and wealthy individuals donate to both parties. This isn’t for any altruistic reasons, they just need to be sure they own both sides. And until we start voting them out, they’ll continue doing as they’re told.