Like all polling firms, Rasmussen Reports weights its data to reflect the population at large. Among other targets, Rasmussen Reports weights data by political party affiliation using a dynamic weighting process. Our baseline targets are established based upon survey interviews with a sample of adults nationwide completed during the preceding three months (a total of 45,000 interviews). For September, the targets are 39.7% Democrat, 32.1% Republican, and 28.2% unaffiliated (see party trends and analysis). For the month of August, the targets were 40.6% Democrat, 31.6% Republican, and 27.8% unaffiliated.
So it was:
AUG 40.6% dem 31.6% rep 27.8% unaffiliated
SEP 39.7% dem 32.1% rep 28.2% unaffiliated
I still would like to see Rasmussen explain why the dem# went down but rounding the numbers are 40/32/28 an 8point lead for dems not a 12 lead for rep like you claim.
Of course maybe the 40/28 split was for a deep south state like Georgia or Alabama but that would kinda make sense because there are a lot of fucking REDS in the south.