Tuesday is a big primary day. Here are key races to watch

Elections Polls are now closed in all 6 states holding primary elections. Here's who won so far Updated June 3, 20261:05 AM ET Originally published June 2, 20265:00 AM ET Saige Miller Voters fill out ballots at Lowe Park Arts and Environment Center on Tuesday in Marion, Iowa. Iowans voting in today's primary election will nominate candidates for governor, U.S. Senate, and U.S. House in advance of this fall's midterm elections. Stephen Maturen/Getty Images hide caption toggle caption Stephen Maturen/Getty Images Polls are officially closed in New Jersey, South Dakota, Iowa, New Mexico, Montana and California, where voters cast ballots in primary races for U.S. House, Senate and statewide offices. Most of the attention is on California and Iowa, where there are competitive primaries for governor. In both states, the Democratic Party also sees a road map to control of Congress in the fall. In California's unique primary system, voters send the top two vote-getters to November's general election, regardless of candidates' political parties. Democratic Gov. Gavin Newsom is term limited, and California voters will also pick who should move on to the general election in five new Democratic-leaning congressional districts. That primary was too close to call early Wednesday morning. Sponsor Message Elections Reality TV stars throw their hats the ring for public office In Iowa, Democratic voters picked state Rep. Josh Turek as their candidate in a key Senate race. In order to win a majority in the Senate, Democrats must pick up four seats, forcing the party to win in Republican-leaning states like Iowa. For the first time in years, Iowa Democrats have a shot at winning the governor's office. Here are key races to follow: California governor | California U.S. House | Iowa governor | Iowa U.S. Senate | New Jersey and Montana You can also check out June 2 voter resources from the NPR network. California decides top two gubernatorial contenders It's been a chaotic scramble to pick the next leader of the country's largest state. After three prominent Democrats — former Vice President Kamala Harris, Sen. Alex Padilla and state Attorney General Rob Bonta — decided not to run, Democratic voters haven't had a clear front-runner for the first time in decades. Voters have more than 60 candidates to choose from, but only a fraction of those are considered serious contenders. Only the top two vote-getters will move on to the general election in November. California Democratic gubernatorial candidate Xavier Becerra hugs a supporter at the Long Beach Arena on May 31 in Long Beach, Calif. Apu Gomes/Getty Images hide caption toggle caption Apu Gomes/Getty Images The race got a shakeup when former Democratic Rep. Eric Swalwell, the presumed favorite, dropped out of the…