When they were doing CNN/Gallup last year, they had 40% Republicans in their sample. It shrunk in this survey.
Non election year, they should just do random adults and not registered voters, because it's always a guess as to who will show up to the polls.
Back to the poll numbers, they aren't great to be honest. Harris was at 40, gallup is at 40, ARG at 36. Rasmussen at 48. You can toss the Arg. Rasmussen probably is an outer number. The president probably is in the low 40's right now. But... he always sinks during the August vacation/recess and bounces back up in September when he is more visible.
It shouldn't make a difference.
USA Today and CNN usually just sponsor the poll, and the rights to report on it exclusively. They probably did so in this poll as well.