We do not have the ability as citizens to bring a bill to the floor of congress for a vote. We need a representative to do that for us.
We try to send people to congress to represent us and not themselves, but the amount of money is a very great temptation that most can not resist, and we need more than just a few representatives to pass a change to the law or current status quo.
Sure we can call our representatives and threaten to not re-elect them. We can send signed petitions. We can rally, advertise, and promote our point of view... but it all comes down to a vote by the representatives themselves.
The problem is the checks and balances on our gov't have been watered down by corruption, and I don't see how we can change that without an actual revolution. If you have some inside information, or some path to change that I don't recognize, please by all means... Share!