More possible topics:

• Is opening up basic scientific research to a market-based system of competition (to replace the current system of subsidies and grants) possible? Bigelow Aerospace's $50 million "America's Space Prize" suggests an interesting new way of looking at scientific research. Would it be possible to replace government institutions like NIH with a system of grants and prizes offered for useful research in different fields?
• The 1st Amendment gives us certain rights. Does it also give us any obligations?