we do not know the exact number yet, or if the fire marshal will give an official estimate. nbc's reporter on the scene katy tur estimates on the generous side tonight, the crowd is 20,000 to see donald trump, which means the expectation game was actually turned upside down for him tonight. with all the bragging about what a big room, abig arena he needed to fill, raising expectations throughout the course of the day how thousands of people wanted to go see donald trump, he ended up talking to a large crowd of people but one that didn't look like that big in context because the arena is so big. if you are in a room that seats 50 thourk people, 20,000 doesn't look like much. if you are in a room that seats 20,000, 20,000 looks like a ton. because donald trump is now such a clear front runner for the republican nomination, because he's leading in states across the country and has been leading in the national republican polls