Now, where Hillary’s problem was she took states like Michigan and Wisconsin for granted and failed to campaign there, Biden’s problem is he’s taking too long to campaign there, and he’s burning money in states that his advisors are telling him are in play (Florida, North Carolina) when they really are not.
Biden can’t wait until the convention in August to start the campaign proper, and that seems to be what he’s doing. That only gives him just 78 days to mount an effective defense. 2 months and change.