[EM] BC & PR

[Bart Ingles]

Steve Barney wrote:
> 
> [...] The BC is not always proportional, but it is under
> certain, arguably the most appropriate, conditions, as when 2 blocs of voters
> are completely polarized and vote the reverse of each other. For example, if,
> as in some voting rights court cases based on racism, the preference order of
> virtually all the black voters is the reverse of virtually all of the white
> voters, the blacks may elect someone with the same proportion as is required by
> the Hare method. If there as two seats and four candidates, for example, a
> minority bloc (such as voters who prefer A>B>C) may elect its most preferred
> candidate with just over 1/3 of the electorate, even though the majority bloc
> may prefer the reverse, C>B>A. [...]

The problem is, the results depend heavily on how many candidates each
group decides to run.