Massachusetts voters are among voters in 15 states and one U.S. territory casting a ballot today as they decide who to nominate as their party's candidate for president.

Massachusetts has an open primary so unenrolled voters can go to their local polling place and cast a vote in either the Democratic, Republican or Libertarian Party primary. Voters who are registered as part of a party can only cast a vote in that party's primary.

Voter turnout is expected to be good in Massachusetts, but not record-breaking, according to Secretary of State William Galvin. As of Friday, 9% of voters had cast ballots as part of early voting.

Read more at heraldnews.com.