The (R) doesn't mean much here. It's not for a partisan sponsor and Cygnal is otherwise about as (R) as PPP is (D). It's a good firm.
It's a little suspicious that they seem to have chosen not to poll the Presidential race and led the poll with the Senate race instead. PPP is sometimes good and sometimes blatantly partisan; same can be true for Cygnal.
Also, "Ready Education Network" is a pro-charter school organization with strong Republican Party ties (from the lead on their website: "Ready Education Network is a coalition of conservatives fighting for better schools and more parental choice in education"). It is a partisan sponsor.
https://readyeducation.org/about-us/
