What role does Gregorian say higher education plays in a representative democracy?

When Moyers asks Gregorian why Obama should invest in education in the middle of an economic crisis, what rhetorical method does Gregorian use to respond? Remember that the Rhetorical Terms presentation slide on common types of examples includes real events, invented instances, and analogies.
The Rhetorical Terms presentation has a slide on the importance of definitions. Why does Gregorian define education as an investment instead of an expense?
What role does Gregorian say higher education plays in a representative democracy? What role does he say Moyers’ profession, journalism, plays in a representative democracy?
http://www.pbs.org/moyers/journal/01302009/transcript2.html

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