From the poll’s internals:
Sampled voter breakdown; 600 likely voters 4% +/- MOE
DEMOCRATS 319 53%
REPUBLICANS 214 36%
INDEPENDENTS 67 11%
Again, like the recent PPP poll, Democrats have been undersampled and Republicans have been oversampled. Both the PPP poll and KOS are lefty leaning pollsters, so it would be interesting to know what the motivation is for showing Burns ahead.
You’re right again, the Dems are being undersampled. Like you I wonder what their motivation is.