Why did the Democrats refuse to let Biden run against Trump?

Why did the Democrats refuse to let Biden run against Trump?

Don't you dare tell me it was Joe's idea to be thrown under the bus by his own loyal party

You could've had it all. Iran would've had nukes by now. The border would still be wide open. The Venezuelans would still be starving under Nicolás Maduro’s thumb. Seniors would still be paying income tax on their meager Social Security. The 8000 military members would still be fired for refusing to take the experimental vaccine that doesn't work. It would've been heaven on earth.

Why did the Democrats refuse to let Biden run against Trump?
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