Change is trash, but this is quite interesting - Biden's margins grow a good amount when you add Klobuchar, or especially Harris into the mix as VP:
H2H:
Biden 49 - Trump 46
Biden/Whitmer 49 - Trump/Pence 47
Biden/Abrams 46 - Trump/Pence 48
Biden/Klobuchar 50 - Trump/Pence 45
Bden/Warren 47 - Trump/Pence 47
Biden/Harris 51 - Trump/Pence 43
The VP choice mattering this much is, of course, utter nonsense, but it is nonetheless interesting that Whitmer underperforms Harris and Klobuchar in her home state. It is also underscores the fact that Harris is probably a very solid choice. She's not really gonna scare many people away from the ticket.