Though Some Fundamental Values Remain Relatively Unchanged Over the Course

Though some fundamental values remain relatively unchanged over the course of one's life, some opinions about political issues are less stable.What causes people's opinions to change over time? In your answer, discuss John Zaller's three-stage model of opinion formation and the "online processing model" of opinion change.In addition, identify a contemporary political controversy where the American public's opinions have changed and explain why the change occurred.