This poll doesn't really show much, seems very skewed. McCaskill should be somewhat worried by this.
Then again, no one seems to have pointed this out: This poll is pre-Greitens scandal.
I don’t see how that could affect this race much at all.
The only way it might is if Greitens remains in office and is incredibly unpopular by November then he may be a drag on the rest of the ticket. A somewhat related scenario sort of happened to Republicans in Ohio back in 2006 with an unpopular Governor negativity affecting the rest of the ticket.
Wait, that's why DeWine got clobbered? Never knew that.
That and Bush wasn't popular either.