The number of its members who are affiliated with the political party with the largest percentage of the registered voters in the State who are affiliated with a political party (as determined with respect to the most recent statewide election for Federal office held in the State for which such information is available) is equal to the number of its members who are affiliated with the political party withthe second largest percentage of the registered voters in the State who are affiliated with a political party (as so determined)
This part would be a bit concerning if some US Senate elections go uncontested and the state would end up with some third party like Greens or Libertarians getting the second place position on the commission.
Also the bill seems completely open and vague on what rules would be followed to draw the districts and what happens if the two side can't agree.
I don't see the real benefit to mandating open primaries either (which is almost a third of the entire bill's wording in section 3).
This measure is extremely lacking overall, needs a lot of work.