Progressive Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezWhy Democrats must confront extreme left wing incitement to violence The Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' House Democrats postpone vote on marijuana decriminalization bill MORE (D-N.Y.) reacted to 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's primary wins on Tuesday, telling supporters it was "a tough night" for 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's (I-Vt.) supporters.

"There's no sugarcoating it. Tonight is a tough night," Ocasio-Cortez, who is one of Sanders's most high-profile supporters, said in an Instagram Live video.

"Tonight is a tough night electorally," she added before citing the generational gap in support between Sanders and Biden. "Older voters, which we know are more reliable voters, which we know turn out, have decisively gone to former Vice President Biden."

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"There's a generational divide within the Democratic Party on health care, on climate change, on foreign policy, pretty much every policy imaginable," she said. "As a younger person in this movement, I take a lot of that as information for how we navigate the next decade.

Ocasio-Cortez congratulated Biden on his victories, saying, "If you win a race, you win a race."

Biden scored decisive primary victories on Tuesday, shoring up support in Michigan, Missouri and Mississippi, adding to a growing list of wins across the country.

The former vice president appeared to strike a unifying tone in an address on Tuesday and reached out to Sanders's supporters.

"I want to thank Bernie Sanders and his supporters for their tireless energy and their passion," Biden said in Philadelphia. "We share a common goal, and together we'll defeat Donald 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."