Is it partisan to point out that pretty much anyone in politics is in a different economic class than 98% of the country? I'm pretty sure he meant that when he said group, not Dem vs Rep.
No, that isn't. But that's also being much more specific and is closer to citing something substantial. You provided numbers, and that's the first step to relevance.
I think he meant that the people who write the laws are lawyers - and thus there is an inherent conflict of interest.