Counting the two Independents as Democrats, who they caucus with:
Top 25 states:
2 Democrats - 52%
2 Republicans - 40%
Split - 8%
Bottom 25 states:
2 Democrats - 36%
2 Republicans - 60%
Split - 4%
Top quintile:
2 Democrats - 50%
2 Republicans - 40%
Split - 10%
2nd quintile:
2 Democrats - 60%
2 Republicans - 30%
Split - 10%
Middle quintile:
2 Democrats - 40%
2 Republicans - 60%
4th quintile:
2 Democrats - 30%
2 Republicans - 70%
Bottom quintile:
2 Democrats - 40%
2 Republicans - 50%
Split - 10%
The very top and very bottom are a 55% to 45% split in either direction. It's not a heavy skew, a single party flip in the quintile from the majority to the minority would make it 50/50 even. Those quintiles cancel each other out when voting on party/caucus lines. It's actually the 2nd and 4th quintiles that have the biggest skews. Democrats take the 2nd quintile while Republicans take the 3rd and 4th.
Top 25 states: 2 Democrats - 52% 2 Republicans - 40% Split - 8%
Bottom 25 states: 2 Democrats - 36% 2 Republicans - 60% Split - 4%
Top quintile: 2 Democrats - 50% 2 Republicans - 40% Split - 10%
2nd quintile: 2 Democrats - 60% 2 Republicans - 30% Split - 10%
Middle quintile: 2 Democrats - 40% 2 Republicans - 60%
4th quintile: 2 Democrats - 30% 2 Republicans - 70%
Bottom quintile: 2 Democrats - 40% 2 Republicans - 50% Split - 10%
The very top and very bottom are a 55% to 45% split in either direction. It's not a heavy skew, a single party flip in the quintile from the majority to the minority would make it 50/50 even. Those quintiles cancel each other out when voting on party/caucus lines. It's actually the 2nd and 4th quintiles that have the biggest skews. Democrats take the 2nd quintile while Republicans take the 3rd and 4th.