If you go by the couple of web sites that track republican voting in the house and senate, the party has representatives that literally vote with democrats almost 80% of the time. In fact, members that vote concervative more than 70% percent of the are considered alt-right. There are likewise websites that track democrat members of congress, and I can’t find a single democrat who votes liberal less than 80% of the time. And that is only a handful. Tell me again about ideological purity?
I frankly don’t find those numbers credible, but I’m open to having my mind changed. Could you please cite one or two of those websites?