By representing every state equally, regardless of population, the Senate actually is representative of a pseudo-nation with different demographic characteristics than the actual country. The pseudo-nation represented by the Senate is more white (non-Hispanic), less black and less Hispanic than the nation at large. This is likely not surprising. I haven't dug that far into the rest, but it would be interesting to see what other trends there are in the actual population versus the population implied by the Senate.
And yet which chamber has actually passed a comprehensive bill on immigration?
The Senate was also the first chamber to pass the thirteenth amendment way back in the Civil War. Because of the Senate's nature, it is more willing to compromise because its purpose is as I said, designed to encourage states to join together to ensure each other's interests are protected and that instills a greater sense of comity then the majoritarian House has historically functioned as. The House is also far more partisan and far more political because it is up every two years instead of every six years.
Yeah, you're absolutely right about what chamber has passed what. I'm less interested in looking at and extrapolating things about the current membership of the Senate, as I am about looking at how the pseudo-population implied by the Senate twists the electorate around. There are few enough Senators that it's really easy to get seemingly anomalous or idiosyncratic results in reality.