37 percent of 2020 voters were Republicans. That USA Today Suffolk poll had it at 33.5 iirc.
https://www.forbes.com/sites/brianbushard/2024/01/12/voters-who-identify-as-independents-skyrocket-—as-democrats-and-republicans-dwindle/
January this year.
The pollsters will use recent elections for all sorts of parameters. But that article lays out 2024 reality.