Clinton won Maryland by 26 points, so this is pretty in line with expectations if a bit low, possibly a reflection of this pollster's pro-R bias.
What's interesting to me is that they have Biden winning black voters 86-8. No exit poll in Maryland in 2016, but PG county (61% AA) voted Clinton 88-8, meaning she probably was in the mid-90s with black voters... perhaps this number indicates some slippage for Biden. It could also just be a MOE thing.
When Biden is nearly 90% with the black vote, and Trump is at 8%, that seems like splitting hairs a bit, when it could easily be in the MoE, and those 6% undecided.
