Campaigns start with Iowa caucuses followed by New Hampshire
The New Hampshire primary has played a key role in American politics since 1952. New Hampshire has protected its first primary in the nation status by passing a law that gives its secretary of state the power to change the date in order to precede any other primary by one week. In 2012, the New Hampshire primary took place on January 10th.
The Democratic and Republican Parties have cemented New Hampshire’s role by limiting other states from holding any contests and punishing them for holding any elections before Iowa and New Hampshire. Instead of holding contests before Iowa and New Hampshire, for which they could lose delegates at the convention, several states have scheduled their contests to occur immediately after Iowa and New Hampshire.
Each state highlights one of the two main ways voters choose delegates.
Caucuses are local, in-person meetings of party members, usually at the precinct level. Often, fewer than 10% of Republicans or Democrats participate in caucuses, so many observers question their effectiveness.
Soooo.... I'd say Iowa but but seems almost like a trick question. Good luck!