I'll throw in another $25 to a local shelter on Trump for anyone willing to take the bet. His ratings are good, pretty much on par but much less fluctuating than Obama's or any other President, that means voters believe he is consistent (regardless which direction you stand on him).
On the other hand you have Biden, do you really think the 'security moms' and suburbia in general will want a President that stands with Antifa protesters against the police, bends the knee on television for the flag and on a better day acts like a creepy, hair-sniffing child molester?
Trump definitely has a chance of losing, but he's proven his economic skills and withstood many trials by fire. All he has to do is point at Biden and run some ads about the comparisons. The other thing Biden doesn't have is a good track record, again, another thing Trump can say: well, you had your 200 years in politics, what have you ever done?
The last problem for Biden is that he lost his only claim to 'good' records since the left wing has reversed on every one of their own policies that Biden signed (90s crime bill and forced bussing), even his current platform is talking about the middle class which the far-left has rejected has any claim to their wealth.
Biden seems like the politician that got left in the 20th century to me, I think a lot of people on both sides of the aisle think that and his VP pick will probably undermine most of what he stands for and his support base.