I think it will depend on the outcome of Hillary's Beghazi testimony and what comes from her email scandal. If she gets indicted or takes a major legal hit from one of these things Biden might then jump in because she will either be forced to drop out or be seriously damaged by it.
If nothing comes of it (which is what I think will happen) I don't think he will get in. Hillary did really well at the debate and has seen her numbers increase since. She will be very hard to beat and I don't think he will want to get into it just to get his ass kicked.
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