Iowa and New Hampshire have long cemented their status as the first-in-the-nation deciders in presidential nominating contests. This outsized influence has increasingly come under scrutiny.
A political scientist traces the development of the first-in-the-nation Iowa caucuses and how the small, rural state became influential in presidential politics.
The incumbent president is struggling in the polls, with his biggest hopes an improvement in economic sentiment before the election, and a conviction for Trump.