#2 is categorically true. Biden has consistently held a larger lead, maintained a larger absolute share of the poll, and had better favorable/unfavorable ratings. There is no way that you can claim that Clinton was ever more popular than Biden except perhaps for that brief period before she actually declared herself to be a candidate.
For #4 the economic growth was under Obama but it meant that at the time of the election people were (mostly) fat and happy; the cost of taking a chance seemed to be lower and it was easier to tell yourself that 'this guy is a businessman, he could not fuck up this strong economy and might even do better.' Now people can see what a catastrophic mistake it was to make this assumption, but I can almost understand the reasoning. I think the point of claim #4 was basically that the most that any candidate could claim about the economy is that they would have recovered it better or done it faster -- another important claim that could be made about it would be that you would make sure that the 'right people' got more benefits from the rising economy and not those elites; the basic populist economic playbook.
For #4 the economic growth was under Obama but it meant that at the time of the election people were (mostly) fat and happy; the cost of taking a chance seemed to be lower and it was easier to tell yourself that 'this guy is a businessman, he could not fuck up this strong economy and might even do better.' Now people can see what a catastrophic mistake it was to make this assumption, but I can almost understand the reasoning. I think the point of claim #4 was basically that the most that any candidate could claim about the economy is that they would have recovered it better or done it faster -- another important claim that could be made about it would be that you would make sure that the 'right people' got more benefits from the rising economy and not those elites; the basic populist economic playbook.