It probably is, although I can’t quickly find a direct source. The “middle class” is extremely broad in the US, encompassing like 60-70% (or more) of the popula

It probably is, although I can’t quickly find a direct source. The “middle class” is extremely broad in the US, encompassing like 60-70% (or more) of the population, with the lower class taking up 20-30% and the upper class taking 1-10% (these things aren’t well defined). It would be shocking if most Congress critters were coming from such a small upper class. Some evidence- since 1952, 5 presidents could be said to coming from the upper class (Kennedy, 2 bushes, Johnson, Trump) and 7 came from middle to lower class backgrounds. I also saw an article (which I can't find right now) that while top private colleges were disproportionately represented in congress, the majority of members still did their undergrad at state schools or die not attain an undergrad degree.