Why is Biden running when he has been accused of sexual assault?

He has no chance, plus, he didn't care enough for Anita Hill, which makes him a sexist, he should just step down, he's too old. Also, I don't think Biden is a Liberal or not enough of a Liberal. Trump is very conservative and he has his base followers.
Update: Dr. Manhattan, who said he's running as an independent?
Update 2: Stop moving my question to a unrelated category.
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