Ipsos: Biden +8

[Pollster]

How are so many people still undecided? My first thought that Sanders supporters haven't completely come around yet, but Trump's support will definitely go over 39%. I guess that a lot of people still aren't happy with either candidate.

I have no evidence to prove this, but I'd wager there are a lot of wealthy, finance-focused folks who are waiting to see if a) Trump can recover the economy and b) Biden sticks with an economic message friendly to them.