Biden is such a competent politician that he dropped out in 1988 due to plagiarism, couldn't crack 1% in 2008 and dropped out after raising about $20, and didn't run this time because he knew Hillary would clean his clock, which he outright admitted.
If not for plagiarism charge, Biden would almost certainly make a very strong candidate. I can't see how his 2008 performance is relevant. Whether he could or could not win this time, as incumbent Vice President he would be in much stronger position. He'd probably be the only viable "establishment" option other than Hillary and, frankly, you and other Hillary supporters should be grateful to him, for he made it much easier (not only by not running, but also by waiting for the very last moment to declare he's out).
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