I think they have it in Australia?
And there is actually a fancier political name for it than "ranked system" but I forget what it is and don't feel like looking it up.
It is so so so stupid not to have it.
It makes people afraid to vote for who they really want (third parties, "unpopular", poor, enendorsed candidates etc...).
Like in the predidential election if say 55 percent of the country did not want bush (made up number!) someone could vote for nader and say their second choice was kerry, third choice micky mouse, 100th choice bush. That way a candidate that more of the country did not want could never win.
Why would anyone not want that?