Current congressmen are not allowed to enter.
They spew all the time, it would not be fair.
They found a friendly farmer who allowed them to host an event. His manure spreader wasn't being used so he invited Hatch to climb aboard to address the crowd.
After Hatch's pep talk was well received, several of the people in the crowd remarked that they've never even seen a Republican before. Hatch quipped back "And I'll bet the rest of you have never seen one speak from a Democrat platform!"