I think the choice of Biden had more to do with electability. He's the one seen as having the best chance of beating Trump. Not political philosophy. Most polls show that to be true. At least at this point in time. Now when the campaign begins, all the negative attack ads, the debates, the sowing of energy within one's supporters and a host of other things, remains to be seen. The Democrats don't need another ho hum campaign taking the election for granted as in 2016.
I like Joe, always have. But I do wish he was 10-15 years younger.
It's high past time that we start electing Americans to congress and the presidency who put America first instead of their political party. For way too long we have been electing Republicans and Democrats who happen to be Americans instead of Americans who happen to be Republicans and Democrats.