[smileysteve]

You could, but that would be less precise.

* Doesn't have enough votes in congress, even though 95% of a single caucus that makes up 50% supports it because 10% of votes have to come from another caucus.

If 49% votes consistently binary; and another party has 5% on a gradient depending on policy; and 60% of consensus + executive signing is required then no, you can't ignore the issue of having 2 parties.