I like that the Australian Senate fixes the issue of equal suffrage in a federal system by 1) electing 12 senators per state, using 2) multi-winner ranked-choice voting.

At the very least, the U.S. could resolve the relationship between rural-urban polarization and equal suffrage of states by raising the number of senators elected per state to at least 6 (giving us multi-winner senate elections every two years in every state), giving us a 300-member senate in which two members are elected every two years to six year terms from every state, and electing all senators using multi-winner RCV.

I initially thought that simply raising the number of senators per state to three would be sufficient, but the issues of (1) 6-year terms and (2) single-winner elections means that states holding elections every two years (rather than states currently taking one even-numbered year off, as per the Senate classes arrangement) would carry out more of the same polarization.

But raising the number above three per state would mandate at least one multi-winner election for each state within a six-year interval.

So not only should we uncap the House to at least 693 members using the cube root rule, but we should uncap the Senate to 300 members.

Delegates to the Senate?

And while adding senators to the Senate would require amending the constitution, I do have an idea that (voting) delegates could also be elected to the Senate by mere statute, without violating the equal suffrage mandate.

This could mean that, in at least two Senate elections per state (out of three total every six years), a senator and a delegate could be elected jointly using multi-winner RCV, while the third Senate election following would jointly elect two delegates, all for six year terms.

In summary, every state would have the following every two years using RCV:

• Class 1: Senator and delegate
• Class 2: Senator and delegate
• Class 3: Delegate and delegate

Finally

Finally, what if the House is expanded to four-year terms, like in most other democracies? Then it would make it unfeasible to hold Senate elections in three classes divided by year, since there would be Senate elections which are held in non-House years. I would instead consider two classes of elections instead of three, extending Senate terms to eight years and splitting the federal elections in half into quadrennial cycles.

Granted, this would require amending the constitution, but still…