MSNBC's Kornacki on millennial challenger beating Crowley: 'This is a seismic political upset!'

MSNBC's Steve Kornacki called the upset victory by 28-year-old Alexandria Ocasio-Cortez, a former organizer for Sen. Bernie SandersBernard (Bernie) SandersFive takeaways from Cruz, O'Rourke's fiery first debate Ben & Jerry’s co-founders announce effort to help 7 Dem House challengers Dems look to Gillum, Abrams for pathway to victory in tough states MORE’s (I-Vt.) presidential campaign, in New York's 14th Congressional District a "seismic political upset."

“We saw these numbers coming in, we couldn’t believe it. We checked, we reloaded. This is a seismic political upset!” said Kornacki, who serves as a national political correspondent for NBC News and MSNBC, during the network's coverage of primary races late Tuesday

Ocasio-Cortez beat 10-term incumbent Rep. Joseph Crowley (D-N.Y.) easily, gaining 57.5 percent of the vote compared to his 42.5 percent.

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“To put this in some perspective,” Kornacki added, “Joe CrowleyJoseph (Joe) CrowleyFor Capuano in Massachusetts, demography was destiny Carper fends off progressive challenger in Delaware primary Election Countdown: Fallout from Massachusetts stunner | In Delaware, Carper looks to avoid next progressive upset | Dem 2020 primary already in full swing | How a Dem ex-governor hopes to take red-state Tennessee | GOP challengers hit Dems over tax votes MORE has been there since 1998, he was thought to be the next Democratic leader in waiting, potentially a Speaker of the House here, he runs the Queens County Democratic Party in the old sense of the word.”

Ocasio-Cortez's victory in the district, which covers parts of New York boroughs Queens and the Bronx, sent shockwaves through the political world, with the former bartender being the top-trending topic on Twitter Wednesday morning.

"This photo is from Nov. 14, 2017. Alexandria Ocasio-Cortez, 28, was then working as a bartender. Less than a year later, she defeated the likely next Speaker of the House, and will almost certainly be the youngest woman ever elected to Congress," wrote Washington Post reporter Jeff Stein.

Ocasio-Cortez won despite Crowley outspending her nearly 10-to-1, with the incumbent spending $1.09 million to her $127,000.

Sanders took to Twitter to congratulate her, calling the victory "extraordinary."