Its victory in the Spanish national election of November 2011, was counteracted in Catalonia with a secessionist majority in its Parliament for the first time in democracy. (blog.politics.ox.ac.uk)
Justin Trudeau will be Canada's new prime minister, after his Liberal Party won a clear majority in Parliament in yesterday's national election. (nystateofpolitics.com)
You weaken the advantages of plurality systems (e.g. clear majorities in parliament, simplicity) while still not really creating a fully representative parliament (if the second candidate / party gets no vote in parliament at all, there are still winner - takes - all effect and some potential for gerrymandering). (politics.stackexchange.com)