The whole point of sampling is to achieve something reflective of the average opinion of a far larger group ~ and you attempt to do that with a random sample.
If you subsequently adjust your random sample to reflect what you think you want, it is no longer a random sample poll ~ it's just an auger ~ rather like the ones the Roman's looked at.
The party weighting in this poll is pre set to 37 Dem, 30 GOP. It has been this way every single day since its inception.