Key takeaways from primary elections in Los Angeles, Iowa and New Jersey

Embattled incumbent Mayor Karen Bass has reason for enthusiasm in Los Angeles.

The results of House, governor and mayoral primary elections in six states on Tuesday night show some promising signs for incumbents and the Democratic establishment and the potential limits of an endorsement from President Donald Trump.

They also show what a key toss-up race jolted by a congressman's absence will look like in the November midterms.

Karen Bass is first LA mayor in more than 20 years to face runoff

In Los Angeles' closely watched nonpartisan mayoral primary race, embattled incumbent Mayor Karen Bass has reason for enthusiasm after months of uncertainty, while reality star Spencer Pratt still has to play the waiting game, although he appears to have put up a strong showing. ABC News projected on Tuesday that Bass will advance to a runoff in November, meaning she will have a shot to keep her seat.

Bass, the first woman and second African American elected to lead the city, is the first Los Angeles mayor to face a runoff in more than two decades.

Bass dedicated her reelection campaign to emphasizing her past experience and achievements in the role, but faced scrutiny over her record and battled criticism for her handling of last year's Los Angeles wildfires. Bass, who was away from the city on a planned diplomatic trip to Ghana when the Palisades Fire first erupted, has pushed back on criticism over her management of the fire, saying earlier this year that her focus "is on the lives and on the homes."

Criticism of Bass gave an opening to Spencer Pratt, the former star of "The Hills," who ran a campaign focused on calling out Bass' handling of the fires and saying that he'd fix a city he felt had become broken.

It's still unclear if Pratt will advance to the next round with Bass, or whether progressive city councilmember Nithya Raman will end up in the runoff. As of Wednesday morning, Pratt is in second place and leads Raman by around 8 percentage points, but there is still around an estimated 40% of the vote left to be counted.

Pratt's current second-place position, which could shift, might be read by some as a limit on the allure of celebrity candidates. However, it could also be seen as a sign of the strength of Pratt running a campaign with a clear message and going beyond relying just on name recognition.

In the state's marquee race for governor, meanwhile, it's still too early to tell which candidates will advance in the top-two primary -- with many mail ballots still to be counted.

As of Wednesday morning, Trump-endorsed Republican Steve Hilton and