Barack Obama marathon hits Berlin

American presidents Kennedy, Reagan and Clinton all addressed Berliners during dramatic moments of struggle and change. Now, a presumptive presidential nominee is using Berlin as a backdrop for his campaign. After meeting with leaders in Afghanistan, Iraq, Jordan, Israel and the West Bank, Obama hits the European continent amidst a frenzy of Obama-mania. How will Obama play later today in the new Berlin? And is it a political gamble to campaign on this grand political stage? Guest Host: Katherine Lanpher; Guest: Jeff Zeleny, The New York Times