TIME’s editor-in-chief on why the Silence Breakers are the Person of the Year It became a ... have unleashed one of the highest-velocity shifts in our culture since the 1960s.

They base this on a study of each state's party competitiveness from 1880 (or year of statehood) to 2010. They assigned each state legislature a competitiveness score, which "can range from 100% if ...