people that are having a problem with him. a lot of the christian conservative voters going over to ted cruz or marco rubio. i think the upset would be if there is a surge to marco rubio. >> yeah. it is great to watch people who love what they do. and michael shure loves in stuff, so pay close attention tonight. michael good to see you. thank you. >>> one of the biggest questions about the caucus s is why iowa? the state's population is smaller than the city of los angeles, but it's impact as you know is huge. mary snow has our report. [ cheers and applause ] >> reporter: yes, it's well-known that iowa is the first in the nation to weigh in on the presidential race. but less well-known are the quirks behind its caucus system. starting with why it became such a draw for white house hopefuls. in 1972 it was only by chance that democrats in iowa scheduled their caucus earlier than everyone else. >> good morning, how are you? >> reporter: in 1976, republicans in the state joined