This is has been true for at least a decade, when they originally did the study.

It's not a bug. It's a feature.

That is correct. Congress have their own discourse while they deal with the public differently. There is a lot of stuff that goes on that clearly does not represent the will of the American people.

Congress represents corporate interests and wealthy individuals who support their election campaigns. The only give lipservice actually giving a shit about the people who supposedly elect them.