(CNN) — Joe Biden mocks Pete Buttigieg’s experience as a small-city mayor in a new digital ad the former vice president’s campaign is set to use on YouTube and Facebook in New Hampshire ahead of Tuesday’s primary.

The ad marks a sharply negative turn as Buttigieg led and Biden finished fourth in Iowa’s caucuses on Monday. Titled “Pete’s Record” and reported first by CNN, it makes a series of cheeky comparisons between the two candidates — contrasting Biden’s time shepherding major legislation to passage and negotiating international agreements with the smaller challenges facing the mayor of a city of 100,000.

It’s the most direct, negative ad aired to date by any leading Democratic presidential contender against a primary rival. The ad reflects a new sense of urgency in Biden’s campaign to slow Buttigieg’s momentum and cast doubt on his electability and readiness for the presidency. Biden and his aides have said they expect to lose New Hampshire, too — but his campaign is looking to regain its footing as the race moves to Nevada and South Carolina later this month.

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“We’re electing a President,” the narrator says. “What you’ve done matters.”

The ad starts with a narrator saying: “When President Obama called on him, Joe Biden helped lead the passage of the Affordable Care Act. And when parkgoers called on Pete Buttigieg, he installed decorative lights under bridges, giving citizens of South Bend colorfully illuminated rivers.”

With each comparison, the music changes from a serious-sounding melody when describing Biden’s record to a clownish melody to denote a mocking tone when describing Buttigieg.

The comparisons include Biden’s help in negotiating the Iran nuclear deal and his work on the Recovery Act. “Both Vice President Biden and Mayor Pete have helped shape our economy,” the narrator says facetiously, saying that while Biden helped revitalize the economy by passing the Recovery Act, Buttigieg revitalized South Bend’s economy by laying out “decorative brick” on the sidewalks.

The ad also knocks Buttigieg’s record on race in South Bend, taking direct aim at the former mayor’s biggest weakness in the Democratic presidential race: his lack of support from non-white voters.

It slams Buttigieg for the firing of the African American police chief of South Bend. “And then he forced out the African American fire chief, too,” the narrator ads.

CNN has reached out to the Buttigieg campaign for a response to the ad.

Buttigieg defended his experience in a debate Friday night in Manchester, saying he brings “a different perspective.”

“Look, I freely admit that if you’re looking for the person with the most years of Washington establishment experience under their belt, you’ve got your candidate, and of course it’s not me,” he said.

He highlighted his military service — Buttigieg deployed to Afghanistan as a US Navy Reserve officer — and time as mayor in an old manufacturing city.

“The perspective I’m bringing is that of somebody whose life has been shaped by the decisions that are made in those big, white buildings in Washington, DC; somebody who has guided a community written off as dying just a decade ago through a historic transformation; somebody who knows what it means to be sent to war on orders that come out of the Situation Room,” he said. “We need a perspective right now that will finally allow us to leave the politics of the past in the past, turn the page, and bring change to Washington before it’s too late.”

Biden’s shift in tone comes directly after he admitted a “gut punch” defeat in Iowa, coming in fourth in the state’s caucuses. Wednesday at an event in New Hampshire, Biden singled out Vermont Sen. Bernie Sanders and Buttigieg during a speech, warning attendees that Sanders would hurt Democrats running in down ballot elections because he is a democratic socialist and admonishing Buttigieg for what he described as criticism of President Barack Obama’s presidency.

And at the Democratic Debate Friday, Biden seemed to downplay expectations in New Hampshire. “It’s a long race. I took a hit in Iowa and I’ll probably take it here,” he said, acknowledging that the “neighboring senators,” namely Sanders and Massachusetts Sen. Elizabeth Warren, are poised to do well because of their geographical advantage.

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