game changer - definition and synonyms

  1.   From our crowdsourced Open Dictionary
    someone or something that completely changes the way that something is done, thought about, or made

    It can be a charismatic game-changer or a resolute champ, but sometimes it is a lower-profile playmaker, or a cult favourite with endearing foibles.

    What have been the Election 2012 game changers?

    Submitted by M. Hardy from Thailand on 03/05/2012