DETROIT - Centrist Democratic contenders slugged it out with their liberal counterparts on the first night of the second Democratic debate on Tuesday.

The debate featured 10 candidates, including progressive stars Sens. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) going toe-to-toe against more centrist candidates like 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.

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Here are five takeaways from a testy night in the Motor City.

1. Debate puts Democratic divides on display

A fight has been brewing for months between the Democratic primary field’s moderate candidates and progressive contenders. On Tuesday, it erupted into public view.

It was former Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (D-Md.) who fired the first shot. In his opening remarks, he bluntly asserted that “we cannot go down the road that Sen. Sanders and Sen. Warren want to take us.”

But he wasn’t the only centrist to take a swipe at Sanders and Warren, who occupy the same progressive lane in the primary contest.

Former Colorado Gov. John Hickenlooper John HickenlooperThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Cook Political Report shifts Colorado Senate race toward Democrat Willie Nelson playing at virtual fundraiser for Hickenlooper MORE delivered a veiled but unmistakable criticism of the two liberals, saying that while he considered himself a progressive, he’s “a little more pragmatic.”

The debate underscored the increasingly volatile divide between Democrats on the direction of the party and which flank is best equipped to take on President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE in 2020.

Moderates argue that only a compromise-minded candidate can appeal to the voters that abandoned the Democratic Party in 2016 to vote for Trump. Progressives, on the other hand, say that only bold, transformational ideas can compete with the president’s own message of political change.

2. Sanders gets lots of time, but Warren gets biggest moment

One of the biggest questions going into Tuesday night’s debate was how Sanders and Warren would handle each other; they occupy similar lanes in the primary field and are currently jockeying for second place in the polls.

But there was no fight between the two progressive standard-bearers. Instead, they found themselves forming a united front against a spate of attacks from the field’s moderate candidates, providing backup for one another on some of their signatures proposals, including, most notably, Medicare for All.

Sanders was assertive in his performance, getting perhaps more speaking time than any other candidate on stage. He scored a standout line after Rep. Tim Ryan Timothy (Tim) RyanNow's the time to make 'Social Emotional Learning' a national priority Mourners gather outside Supreme Court after passing of Ruth Bader Ginsburg Lincoln Project hits Trump for criticizing Goodyear, 'an American company' MORE (D-Ohio) suggested that he didn’t know just how comprehensive the health coverage provided under his Medicare for All legislation would be. The Vermont senator’s answer was pointed.

“I do know that,” Sanders said. “I wrote the damn bill.”

It was Warren, however, that had the biggest breakout moment. Responding to Delaney’s assertion that he was not pitching “fairytale policies,” Warren was blunt.

"I don't understand why anybody goes to all the trouble of running for president of the United States just to talk about what we really can't do and shouldn't fight for," Warren quipped, prompting a roar of applause from the audience.

3. Bullock has big night

Bullock, the former Montana governor, announced his arrival in the Democratic primary on Tuesday night after failing to qualify for the first debate.

At the moment, Bullock is barely registering in the polls, although that could change after his strong debate performance. But the Detroit debate is also likely to unsettle Senate Democrats, as most view him as having a far better shot at unseating Sen. Steve Daines Steven (Steve) David DainesThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Credit union group to spend million on Senate, House races Trump seeks to turn around campaign with Supreme Court fight MORE (R-Mont.), who is up for reelection in 2020, than winning the party’s presidential nomination

Still, there are signs that Bullock could make waves in the race as a centrist who has won elections in a deep-red state.

Bullock was the first to speak on Tuesday night and wasted no time warning that the “wish list economics” of the progressive wing of the party would be a surefire loser in the Trump states that Democrats are trying to win back.

The progression of Tuesday night’s debate repeatedly pit Bullock directly against Sanders and Warren, the leading contenders on stage on Tuesday night, and he refused to back down on the key issues of immigration and health care that have divided the centrist Democrats and the progressives.

When Warren advocated for decriminalizing border crossings and giving health care to those in the country illegally, she made the case that Democrats “must not play into Donald Trump’s hands.”

“But you are playing into Donald Trump’s hands,” Bullock fired back.

And he locked horns with Sanders on Medicare for All, saying he was perplexed that Democrats would so readily abandon ObamaCare for a system that would require a whole new health industry overhaul.

“It used to be Republicans who wanted to repeal and replace, now it’s Democrats,” Bullock said.

Bullock repeatedly used Obama as a cornerstone for where he stands on immigration and health care to urge the party not to drift too far left. And he closed by striking the kind of populist tone that propelled the unlikely candidacies of both Trump and Sanders in 2016.

“Democrats often sound … like the people who shower at the end of the day are part of the problem,” Bullock said. “Far too many of them are being left behind."

4. Williamson's 'dark power' comment breaks internet and keeps her in race

No one knows what to make of author Marianne Williamson Marianne WilliamsonMarianne Williamson discusses speaking at People's Party Convention Fewer people watched opening night of Democratic convention compared to 2016 Marianne Williamson: Democratic convention 'like binge watching a Marriott commercial' MORE’s candidacy, but it seems all but certain she’ll stick around in the race after her turn of phrase about Trump’s “dark psychic force” became the biggest internet moment of the night.

The crowd in Detroit erupted in cheers, Twitter went into a frenzy and she immediately surged in Google searches.

Earlier in the night, Williamson lamented that the “amoral economic system has turned short-term profits for huge multinational corporations into false gods.”

Later, she made the case for reparations, “payment of debt that is owed,” as the only way to address the “emotional turbulence” of slavery.

Williamson’s campaign has bristled at media outlets that have described her as Oprah Winfrey Oprah Gail WinfreyNYT security guard who went viral for interaction with Biden will have prominent role at convention: report Louisville Breonna Taylor billboard erected by Oprah Magazine vandalized with red paint 'White privilege' is the biggest white lie of all MORE’s “spiritual adviser.”

But the language Williamson uses is steeped in self-help and occasionally new age lingo, and she delivers it unapologetically, helping her to stand out from the crowded pack of candidates.

The unique style has turned her into an internet sensation. It might propel her into the fall debates and help her outlast some of the more traditional politicians seeking the nomination.

5. Beto sags; Buttigieg doesn't leave big impression

Former Rep. Beto O’Rourke (D-Texas) was hoping for a breakout moment. South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The 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 MORE needed a standout performance. By the end of the night, neither candidate got what they had hoped for.

After a meteoric rise as a Senate candidate in 2018, O’Rourke has struggled to find the same popularity and enthusiasm in his presidential bid. Even before he took the debate stage on Tuesday night, he appeared intent on recapturing some of his previous energy.

He invited three Lansing, Mich., high school football players who were disciplined in 2017 for kneeling in protest during the national anthem as his guests to the debate, a move that appeared to throw back to O’Rourke’s forceful defense last year of NFL players who took a knee during the anthem.

And in the midst of the debate, O’Rourke insisted that his home state of Texas was a “new battleground state,” before recounting his closely watched, albeit unsuccessful, Senate bid in the Lone Star State.

Ultimately, though, his performance fell flat; he did not stumble, but he didn’t get the breakout moment he needed to re-energize his presidential campaign.

Buttigieg made few waves in the debate. Like O’Rourke, the South Bend mayor didn’t stumble, but the Tuesday night appearance is unlikely to be the catalyst that he needs to extend his momentum.

To be sure, Buttigieg is still polling among the top five candidates, and raised more than any Democrat in the second quarter of 2019 — a fact that his supporters tout as a sign of sustained momentum. But his poll numbers have stalled somewhat in recent weeks, prompting speculation that his rapid rise may be starting to slow down.

Of course, Buttigieg drew roaring applause at one point when he insisted that Democrats should “stop worrying what the Republicans will say” and embrace transformational proposals.

"Let's just stand up for the right policy and go out there and defend it," he said.