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He quickly tweeted the correct way for supporters to show their love.

\"If you liked what you heard tonight, text JOE to 30330 and let's get to work,\" he wrote.

Back in May, at his campaign kick-off speech in Philadelphia, Biden similarly messed up the number for supporters to text.

\"If you want to be part of this campaign, pick up your phones ... Send a text to the word 'United' to the number 30330. OK? That's 'United' 30330. Or 303330 or 300 … but you got it. It's on the back there,\" he said through a laugh.

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