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Part of the issue is Biden spends a lot more than the other candidates.
Big Spender
Biden's biggest problem is that he has to rely on OPM (other people's money) and is running out of OPM to spend. Not even rich liberals want to keep shoveling money into a losing campaign.
Bloomberg can spend unlimited amounts of his own money and never worry about having to suck up to other democrat big money donors. He is the biggest democrat big money donor.