The path to the Democratic presidential nomination begins in Iowa and New Hampshire — but these days it also includes a preliminary stop in Studio 3A at NBC News headquarters in New York’s Rockefeller Center.

That’s the studio from which Rachel Maddow Rachel Anne MaddowMichael Cohen: Trump hates Obama because he's everything he 'wants to be' The Hill's 12:30 Report - Presented by Facebook - Trump floats 0M+ in personal spending for reelection bid Feehery: Unconventionally debunking the latest political conventional wisdom MORE broadcasts her eponymous MSNBC show — the highest-rated on the liberal-leaning network — five nights a week.

An in-person interview at Maddow’s desk has become a rite of passage for many of the Democrats seeking to oust President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE next year.

Former Rep. Beto O’Rourke (D-Texas) was the latest to make the trek on Monday evening as he sought to reset a campaign that has been lackluster so far.

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O’Rourke admitted to Maddow, “I recognize that I can do a better job … of talking to a national audience beyond the town halls we are having.”

Evincing a combination of familiarity and deference toward the 46-year-old anchor, O’Rourke said he was taking “an opportunity to answer your questions, Rachel, and address those who may not have been able to attend [the town halls] and make sure that they can hear what this campaign is about.”

He is the latest in a long line of candidates to avail themselves of the platform offered by Maddow’s prime-time show.

In January, Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) gave her first major interview after announcing her candidacy to Maddow.

Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.), Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.), Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), Rep. Eric Swalwell Eric Michael SwalwellSwalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions Swalwell: Barr has taken Michael Cohen's job as Trump's fixer MORE (D-Calif.) and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE (D) are among the other candidates who have taken their seats since then.

One aspect of Maddow’s appeal for candidates is obvious. She draws a big crowd — something that is increasingly rare and valuable in the fragmented media environment.

“The Rachel Maddow Show” averaged 2.6 million viewers in April, according to the latest ratings from Nielsen, putting her roughly 500,000 viewers ahead of the second-place show on the network, anchored by Lawrence O’Donnell. His show, at 10 p.m. ET, immediately follows Maddow’s 9 p.m. slot.

Maddow’s average viewership, as MSNBC’s public relations team made sure to note, was more than twice that of CNN in the same time slot. Fox News Channel’s Sean Hannity Sean Patrick HannitySunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Cruz: Trump should nominate a Supreme Court justice next week Ex-Pence aide: Trump spent 45 minutes of task force meeting 'going off on Tucker Carlson' instead of talking coronavirus MORE, however, had a higher total audience than either MSNBC or CNN at 9 p.m. in April, averaging 3.086 million viewers.

But Democratic insiders say the payoff from a coveted one-on-one with Maddow isn’t just about the raw numbers.

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“It signals a couple of different things. In one sense, you’ve arrived — millions of people will be looking at you in a forum that will allow you to get your message out,” said Democratic strategist Lynda Tran.

“It also speaks to where your place is in the zeitgeist,” she added. “If Rachel Maddow and her team think you are enough of a draw, that says a lot about you and your own ability.”

There is also the potential for the kind of unexpected, authentic moment that can help a candidate break through the cacophony that already envelops the Democratic field.

Maddow’s interview with Buttigieg, for example, included a conspicuously personal exchange about coming out as gay.

The 37-year-old mayor said he was 33 when he came out, prompting Maddow, who is a lesbian, to remark, “I think it would have killed me to be closeted for that long.”

Buttigieg explained, “There’s this war that breaks out, I think, inside a lot of people when they realize they might be something that they’re afraid of, and it took me a very long time to resolve that.”

Such personal moments are relatively rare for Maddow, who made her name more through making policy discussions prime time-friendly and less through intimate revelations.

“She is one of the few shows that lets candidates really present substantively. She also gets under the real motivations of candidates,” said Democratic pollster Celinda Lake.

Lake also noted that Maddow “is one of the few women leaders” in media and that “Democratic primaries are 59 percent women.”

There is, of course, one other obvious advantage.

In such a huge Democratic field — Montana Gov. Steve Bullock Steve BullockMcConnell locks down key GOP votes in Supreme Court fight Senate Democrats demand White House fire controversial head of public lands agency Pence seeks to boost Daines in critical Montana Senate race MORE (D) became the 23rd major candidate on Tuesday morning — the attention that can be conferred by someone of Maddow’s status can be oxygen, especially for lesser-known candidates.

Given the size of the field, “it is really hard for candidates to get their ideas out there,” said Daniella Gibbs Léger, executive vice president for communications and strategy at the Center for American Progress, a liberal think tank.

“Yes, sound bites get picked up, but if you really want to say something in-depth about your policy on child care or comprehensive immigration reform, she provides a great forum,” Léger said.

Former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE (D) has not appeared on Maddow’s show since announcing his bid on April 25. Nor has Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) done so recently, though he has appeared in the past.

It seems likely they will ultimately do so, even if that could be a more challenging moment for the centrist Biden than for Sanders.

Maddow’s own proudly liberal viewpoint, of course, alienates a swath of the country just as surely as it enamors her fans.

Among Republicans, including some close to Trump, her name has become synonymous with what they see as outside-the-mainstream leftist politics.

Tim Murtaugh, the communications director for Trump’s reelection campaign, told The Hill in an email that Maddow’s prominence was testament to the leftward lurch of the Democratic Party.

“There is no centrist lane in the 2020 Democrat contest. The activist left requires purity of thought and absolute adherence to their socialist policy proposals,” Murtaugh said.

“So it’s not surprising that all the candidates are lining up, hoping to get Rachel Maddow’s seal of approval,” he added. “If they’re looking for adoring approval of their socialist policies, that show is the place to be.”

Maddow would likely take such criticism as a backhanded compliment.

Either way, it seems certain that the Democratic presidential candidates will continue to beat a path to her door.

The Memo is a reported column by Niall Stanage, primarily focused on Donald Trump’s presidency.