As crowded California gubernatorial race comes to a head, Republicans could advance

Democrats are looking to pick up House seats due to redistricting.

During Tuesday's midterm primary election in California, all eyes are on the crowded field of gubernatorial candidates looking to succeed current Gov. Gavin Newsom, who has termed out, in what has become the most expensive governor's race on record.

California hosts "jungle" primaries, also known as non-partisan primaries, which means all candidates are listed on one primary ballot and the top two candidates advance to the general election, regardless of party affiliation. There are 61 candidates running for governor in the state.

The gubernatorial primary has surpassed $315 million in ad spending and reservations, according to AdImpact, making this the most expensive governor's race on record.

The crowded race features many Democratic candidates: former Health and Human Services Secretary Xavier Becerra, San Jose Mayor Matt Mahan, billionaire Tom Steyer, former Los Angeles Mayor Antonio Villaraigosa, former Rep. Katie Porter, and California Superintendent Tony Thurmond. Republicans running include Riverside County Sheriff Chad Bianco and former Fox News contributor Steve Hilton.

Although Rep. Eric Swalwell suspended his campaign for governor -- and resigned from Congress -- in April amid sexual misconduct allegations, he will still remain on the ballot as he missed the deadline to withdraw his name. Swalwell said in April that he "will fight the serious, false allegations that have been made -- but that's my fight, not a campaign's."

Democratic candidates have remained locked in a tight race without a clear frontrunner.

According to a Public Policy Institute of California poll conducted in mid-May, Becerra and Hilton were leading the pack with 23% and 20%, respectively. They were followed by Steyer at 15%, Bianco at 13% and Porter at 12%.

While Democrats have been worried that the significant number of Democratic candidates could split up the vote, resulting in Republicans advancing to the general election, President Donald Trump's endorsement of Hilton has also presented some concern among those who were hoping for the two Republican candidates to advance to the November election.

Under California's top-two primary system, the prospect of two Republicans advancing to November has relied on Hilton and Bianco remaining closely matched in the polls. However, Trump's endorsement could mean increased support for Hilton might come from those who previously backed Bianco. If Hilton gains while Bianco's support holds steady or declines, a Democrat could overtake Bianco and acquire the