Why are South America's leaders meeting in Brazil?

Leaders from South America's 12 nations have met in Brazil. Their host president, Lula da Silva, is calling for more unity and even a new single currency. So, what are his plans and could they become reality? Join host Adrian Finighan. Guests: Temir Porras Ponceleon - Managing Director of Global Sovereign Advisory.  Guillaume Long - Senior Analyst at the Center for Economic and Policy Research. Danny Shaw - Professor of Latin American and Caribbean Studies at City University of New York.