The Latest: Polls open for races across the US as a busy primary election day gets underway

Primary elections are underway in multiple U.S. states, including California, New Mexico, New Jersey, and Iowa. Key races include California's gubernatorial contest with no clear leader, New Mexico's governor's race featuring former Interior Secretary Deb Haaland, and Iowa's Senate primary where Democrats aim to challenge a Republican-held seat. New Jersey voters are also deciding a House race affected by a candidate's unexplained absence.