They have it 'Even' between Rs and Dims.
R 28%
D 28%
I 42%
And again 'Even' between lean R v. lean D at 43%.
Monmouth explained how party affiliation works here:
http://monmouthpoll.blogspot.com/2016/08/a-poll-samples-party-composition.html
They purportedly culled the voter rolls and called a basically even sample 34D/34R/32I. People self-identified 36D/26R/39I.
Most pollsters don’t adjust Party ID. They leave it as is. Those that do, do such to their own peril.
They have it 'Even' between Rs and Dims.
R 28%
D 28%
I 42%
And again 'Even' between lean R v. lean D at 43%.