They are assholes
With few exceptions, US Senators are assholes. They are as pompous as they are ignorant, which is not surprising, since they are as powerful as they are unaccountable.
Well, there probably are not any exceptions; not in the senate and not in the house.
Both the above writer and Richard Posner whom he quotes at length miss a key supporting point: all these folks pretend they have some meaningful authority to tell the rest of us how we should live our lives.
They have none. The very fact that they choose to pursue and occupy these offices is all the reason we need to give them no respect.
Oh yea, anyone who thinks these congress critters are anything about representing the people in their states or districts is as foolish as the critters are arrogant.