You are to be commended for withholding the common thread, and I’ll give you an Andy Biggs Rep. AZ, as a direct contrast when one thinks there is a common thread. In my humble opinion the four mentioned are a most uncommon four if one was into historical comparisons of We the People and not their Representatives. I can see where you might take issue with that statement considering Bennett, Hatch, etc. The three you named, act more like the party of the wheel chair bound Mr Reid and not Republicans.
Yup, they represent three states that are Ground Zero for leftist infiltration from California.