Seven Democratic candidates took to the debate stage Friday evening at St. Anselm College in Manchester, N.H., just days before the state's vital primary.

What were the key takeaways?

Fear of Trump casts long shadow

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Democrats are grappling with a new realization of just how close November’s election could be.

The New Hampshire debate came at the end of a week that saw the impeachment process end in President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s acquittal by the Senate, and Trump hitting his highest approval rating yet in a Gallup poll. In tandem, Democrats suffered a fiasco in Iowa, where the final results of the caucuses held on Monday evening are still not clear.

The apparent rise in Trump’s chances of reelection is fraying Democrats’ nerves and focusing their minds.

One consequence on Friday was a reluctance to deepen party disunity.

There were some tense moments — particularly between the two front-runners, Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) and former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE (D). But the sparks never threatened to become a fire.

Comity was the order of the day.

Sanders at one point expressed a wish that he and 2016 nominee Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE could come together, despite her recent sharp criticisms of him.

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At another moment, Sanders and former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE placed their arms around each other’s shoulders. For her part, Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) declined to hit Sanders hard on their differences, instead emphasizing the length of their friendship.

The debate was not all sweetness and light.

Buttigieg made the argument that Sanders was too divisive and prone to a “my way or the highway” approach.

The Vermont senator later assailed the former mayor for the number of billionaires supporting him.

And Warren, in one of her most effective moments of the night, blasted Buttigieg for his record on policing and racial justice.

But, overall, no one really took the gloves off — for fear, presumably, that hitting each other would only help the current occupant of the White House.

Electability is (still) the big question

The dominant question in the Democratic nomination process has been the same from the start: Who is best positioned to beat Trump?

On Friday night, Buttigieg sought to cast his rivals as part of the status quo, and argued that his ability to “turn the page” could be crucial. He also argued that his focus on civility could bring new voters into the Democratic fold. It was a time “for addition, not rejection; belonging, not exclusion,” he said.

Sanders made his own case for electability. He argued that his brand of left-wing populism could be effective because “the way you bring people together is by presenting an agenda that works for the working people of this country, not for the billionaire class.”

Variations on those arguments were deployed by other candidates, too.

Warren, who has recently sought to present herself as a more unifying figure than before, said that her focus on rooting out corruption would appeal to Republican voters. Biden talked up his ability to bring Democrats back into the Senate majority as well as winning back the White House. Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.) emphasized her strong electoral record and modest Midwestern roots as assets in connecting with voters.

The question of whether the centrism espoused by Buttigieg, Biden and Klobuchar is more in line with the nation’s appetites than the sweeping changes sought by Sanders and Warren remains the biggest fault line in the nominating process.

Buttigieg and Sanders stay the course

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The one key outcome from Iowa was the way the caucuses separated Buttigieg and Sanders from the rest of the field.

Their strong performances in that state meant that they could have been targeted by their rivals, or have torn each other down, during the debate.

Neither of those things happened, at least in any significant, game-changing way.

Each made his case and avoided any obvious gaffe that could have derailed his momentum.

In the most recent polls of New Hampshire, the two sit atop the polls, with Sanders maintaining his lead but Buttigieg surging.

That being so, they will be happy enough to have come through Friday’s debate with no reason to expect the fundamentals of the race to change.

Second-tier candidates struggle to make an impact

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No one had a disastrous debate on Friday night. Equally, however, none of the candidates lit up the stage or delivered the kind of standout, viral moment that has the potential to reshape the primary.

That’s fine for Sanders and Buttigieg but a lot more problematic for everyone else.

Biden, who trailed in fourth in Iowa, acknowledged in the debate’s opening stages that he was unlikely to win in New Hampshire. On stage, Biden showed the same pluses (experience and affability) and the same negatives (a lack of incisiveness and a tendency to meander) as he has throughout this cycle.

Warren, a strong debater, laid out her case effectively. But it was largely the same case that voters have already heard — one which delivered a decent but not earth-shattering third-place finish in Iowa.

Klobuchar had some powerful moments — perhaps none more so than her closing argument, where she contrasted her own capacity for empathy with Trump’s “complete lack” of it.

The Minnesotan has had good debates before, however, without them radically transforming her chances.

A good night for moderators

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The old axiom about sports referees is also true of debate moderators: They tend to have done their job well if they’re not noticed very much.

On Friday, the main moderators from ABC News — George Stephanopoulos George Robert StephanopoulosTrump ABC town hall pulls in fewer viewers than 'America's Got Talent,' NBA, Fox News The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks The Memo: Warning signs flash for Trump on debates MORE, Linsey Davis and David Muir — kept things flowing smoothly, without reaching for cheap “gotcha” moments. The same was true of Monica Hernandez and Adam Sexton, representing New Hampshire affiliate WMUR.

There was one moment that did earn broader attention — for the right reasons.

After Buttigieg skated away from an initial question about an increase in black arrests for marijuana possession during his time as mayor, Davis pursued the point firmly. It was so striking that Davis earned spontaneous applause from the audience, a rarity for any moderator.

As that exchange ended, Davis turned to Warren, asking whether Buttigieg had “given a substantial answer.”

“No,” the Massachusetts senator replied, to more applause.