Thank you for that.

I agree, the data does indeed show that Republicans have more voting power per capita, as they have advantages in the bottom 3 quintiles. However, I don't think the correlation of population to party (at the state level) is as extreme as some try to portray it. There are high population Republican states as well as low population Democratic ones. Vermont, Rhode Island, Delaware, and New Hampshire are Democratic states in the bottom quintile.

The top has 11 Democratic votes and 9 Republican votes. The bottom has 9 Democratic votes and 11 Republican votes. If they all vote on party lines it's a tie. So it's really the middle population states that give Republicans their current edge.

It's a frequent criticism that smaller states have outsized representation relative to their population. The US is not alone in this, the EU also has the same characteristic. Germany, the most populous, has over 150 times the population of Malta, the least populous, but only 16 times the amount of representation in parliament (96 MEP vs 6 MEP). By comparison, the largest state, California, has 37 times the population of the smallest, Wyoming, but 18 times the representation in Congress and the electoral college (54 vs 3). Granted, it's not an apples to apples comparison as the votes are divided between houses and the relative power of the EU vs the US federal government but it's a comparison nonetheless.

It's a compromise when trying to form a union of political entities that differ so greatly in size. The smaller entities obviously give up some sovereignty to their larger counterparts. The larger ones seem to have to have to reciprocate in a meaningful way to keep a voluntary union.