The best place to fight this is at the super market. Take the time to find the store manager, tell him you want to buy non GMO food. Tell Kraft, tell ConAgra, tell your local meat cutter.
You MUST create demand before supply will catch up. It is going to be expensive to be on the bleeding edge of this. Take heart though the Europeans have pretty much done this and are a source of both the food and the supply chain support American suppliers need.
If Americans demand a supply of GMO free meat and dairy it will pretty much a feat acompli. Bitching at your US Rep is a waste of time, they are bought and paid for. The produce manager however is not. WAL MART is a good place to start they have the buying power to make things happen.