Poll: John Cox closes in on Gavin Newsom, Kevin de León gaining on Dianne Feinstein

California Lt. Gov. and California gubernatorial candidate Gavin Newsom looks on as he visits the Alice Griffith Apartments on August 22, 2018 in San Francisco, California. California Lt. Gov. and California gubernatorial candidate Gavin Newsom looks on as he visits the Alice Griffith Apartments on August 22, 2018 in San Francisco, California. Photo: Justin Sullivan / Getty Images Photo: Justin Sullivan / Getty Images Image 1 of / 30 Caption Close Poll: John Cox closes in on Gavin Newsom, Kevin de León gaining on Dianne Feinstein 1 / 30 Back to Gallery

According to a new poll, California's two biggest statewide races in 2018 are tightening, as the leads for front-runners Gavin Newsom and Dianne Feinstein have been cut to single digits.

The poll, conducted by Probolsky Research between Aug. 29 and Sept. 2, found that Lt. Gov. Newsom leads Republican businessman John Cox 44 percent to 39, with 17 percent of the poll's participants saying that they are undecided.

Additionally, the poll found that Sen. Feinstein leads progressive challenger Kevin de León 37 percent to 29, with a whopping 34 percent of participants undecided.

In June's primaries, Newsom won 34 percent of the vote, while Cox won 25 percent, with both easily advancing to November's general election.

Feinstein won 44 percent of the primary vote and de León won just 12 percent, with the latter narrowly edging out Republican James Bradley (8 percent) to move on to the general election.

Interestingly enough, the poll found that Newsom and Cox are virtually tied among Hispanic voters, a group the Democratic Party usually carries by a pretty healthy margin.

Newsom leads Cox just 35 percent to 34 percent among Hispanics, with an additional 31 percent undecided.

Also interesting is the fact that de León is doing better with Republicans than Feinstein, despite the fact that de León is advertising himself as the "progressive alternative" to the longtime Senator.

De León enjoys a 31 percent to 26 percent lead over Feinstein among Republican voters, but 43 percent of conservatives said they were undecided.

De León has intensified his attacks on Feinstein in recent days, particularly after the incumbent senator apologized to Supreme Court nominee Brett Kavanaugh for disruptions caused by protesters during his confirmation hearings.

"We should be praising the protesters and standing outside with them, not apologizing for their actions," de León tweeted. "We need a senator from California who will stand up and #RESIST not #ASSIST."

Meanwhile, Republican candidate for governor John Cox has taken his campaign to the state's many DMV offices to promise those waiting in long lines that "help is on the way."

"This is a great reference point for everything John talks about," campaign spokesman Matt Shupe told The Chronicle. "It's about bringing more transparency to government. It's about approaching issues like a businessman. It's about reforming a government entity that nobody is happy with."