Biden tells supporters to 'go to Joe 30330' -- a website not affiliated with his campaign

"If you agree with me, go to Joe 30330 and help me in this fight. Thank you very much," Biden said.

Viewers swiftly took to social media to express their confusion. Biden later tweeted a similar call to action, this time with an instruction to text.

Winners and losers from the second night of the CNN debate

Biden said in the tweet, "If you liked what you heard tonight, text JOE to 30330 and let's get to work." The text returns a fundraising pitch from his campaign.

Biden's final call to action on the debate stage closed out a night of attacks from his rivals in a heated second round of Democratic debates. The debate, hosted by CNN in Detroit, pitted Biden against some of his early Democratic rivals, including California Sen. Kamala Harris and New Jersey Sen. Cory Booker.

Also on the stage Wednesday were Colorado Sen. Michael Bennet, former Housing and Urban Development Secretary Julián Castro, New York City Mayor Bill de Blasio, Hawaii Rep. Tulsi Gabbard, New York Sen. Kirsten Gillibrand, Washington Gov. Jay Inslee and businessman Andrew Yang.

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