What are the defining features of a successful public sphere (per Calhoun)?2

1. What are the defining features of a successful public sphere (per Calhoun)?2. Do you see or experience the type of public sphere described by Calhoun? How does the political culture you find yourself in compare to this ideal of the public sphere?3. Given the definition of the public sphere in Calhoun as a space where we can alter our own conditions of existence and the definition of rhetoric as symbolic action, how would you describe the relationship of rhetoric to the public sphere?