Douglas Todd: Why the Greens don’t attract ‘ethnic’ voters

Why do Green party candidates only win seats in ridings where the vast majority of voters are white?
Federal and B.C. Green candidates have won election in only one concentrated region of Canada, on Vancouver Island and the adjacent Southern Gulf Islands, in ridings that have scant visible minorities compared to most of the country’s cities.
In the Southern Gulf Islands — the heart of the region that has handed victories to the lone federal Green MP, leader Elizabeth May, and to B.C.