[EM] Portland specifics, and ovals for approval cutoff

[Closed Limelike Curves]

Empirically, IRV adoption has no substantial effects on diversity
<https://www.newamerica.org/political-reform/reports/rcv-impact-on-candidate-entry-and-representation/>.
In theory, I'd expect a small decrease in representation for minorities,
because people of color tend to have higher rates of spoiled ballots, so
IRV should hit them the hardest.

In general, the theoretical advantages of IRV over FPP are outweighed by
its practical costs (spoiled ballots, lower trust in elections, cost, etc.).
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