respect
Iowa has been a historically varied state, known for liberal and conservative politicians alike. It is also an unusually political state, owing in large part to its historical large role in the presidential nomination process perhaps because Iowans tend to be less apathetic than other states. While Iowans tend to welcome political discussion more than most, their usual friendliness may at times give way to more hostile debate -- especially when the caucuses near their end, as Iowans have been subject to every candidate parading the state, hosting town forums and debates and soliciting their vote, for a much longer time than the rest of the states are forced to withstand. Feel free to ask Iowans about the caucuses, and don't hesitate to offer your own opinion about political matters, but be respectful.
talk
You should find Midwestern English quite easy to understand.