Polls have opened for the primary election in Iowa, giving voters 14 hours to cast ballots for local, state and national races. Voting began at 7 a.m. Tuesday and is scheduled to end at 9 p.m. Iowa has one of the longest hours for election day voting in the country. Data show more than 40,000 voters have cast ballots during early voting that began May 7.

A new voter ID law in Iowa will see its first statewide soft rollout during the primary. Iowans will be asked to show approved identification before voting. Anyone without an ID will have the option to sign an oath verifying their identity to cast a regular ballot.

Key statewide contests include the Democratic primary for governor and several congressional races. Republicans have several choices for the secretary of agriculture race, and there’s a two-way race for Democrats in the primary for secretary of state.