Because of a little thing called the Iowa Caucus, which will be early next year, and is the first-in-the-nation vote for the presidential candidates from both parties.
And one of the "attractions" at this year's State Fair is an informal (and I would assume, "unscientific") poll taken by Iowa's Secretary of State. As of Saturday night, over 2000 participants from the State Fair have taken part in the poll and here are the results:
The obvious bit that jumps out at your from this poll is Bernie Sanders leader over Hillary Clinton and also the fact that far more votes for Republican candidates have taken place than for the Democrats.
However, I have to mention that this is apparently an unscientific poll and thus should be taken with a rather large grain of salt...
Interesting results nonetheless..