1. As the presumptive nominee, Biden is in pretty good shape for the general. He's consolidating support in the party and has a robust lead in national polls. The one weak area is enthusiasm, where he's weakest Democratic candidate in 2 decade.

2. This recent article runs through the numbers: "Indeed, strong enthusiasm for Biden among his supporters – at just 24% – is the lowest on record for a Democratic presidential candidate in 20 years of ABC/Post polls." https://abcnews.go.com/Politics/biden-consolidates-support-trails-badly-enthusiasm-poll/story?id=69812092

3. Relatively low enthusiasm might not matter in an age of negative polarization. Plenty of voters hate Trump so much they'll vote for any Democratic nominee. But in those states you need not just those voters but also more marginal voters.

4. Like Hillary Clinton in 2016, Biden will absolutely get the very large anti-Trump vote. The tricky thing -- made all the trickier because election will be under in the shadow of covid-19 & renewed voter suppression -- is getting out marginal voters in swing states.

5. I talked to some activists in Pennsylvania who have been working hard to win back those disaffected marginal voters (young voters including young POC, rural former Democrats) about the enthusiasm problem: https://www.thenation.com/article/politics/democrat-pa-biden-problem/