I think it actually increases the chances of a common 2nd choice winning. Extreme candidates are only going to draw from their limited constituencies, but a ch

I think it actually increases the chances of a common 2nd choice winning. Extreme candidates are only going to draw from their limited constituencies, but a choice that's "nice, but not my top choice, but I'd like them if my top choice doesn't get elected" candidate for a lot of people actually does really well in this sort of system.