President Obama has hard road ahead as he flies to a NATO summit in Lisbon, Portugal. Robert Siegel speaks with Nicholas Burns, former undersecretary of state for political affairs in the Bush administration, about the summit scheduled to begin Friday. Conferees will discuss NATO participation in establishing a secure Afghanistan. They will also discuss a new security concept for the alliance in the 21st century. Burns talks about the difficulties confronting President Obama as he tries to coordinate U.S. policies with those of other NATO members.