President Barack Obama with first lady Michelle Obama and daughters Malia and Sasha, right, tour the Christ the Redeemer Statue in Rio de Janeiro, Sunday, March 20, 2011. Pablo Martinez Monsivais / AP Photo Obama waves to the audience after delivering remarks at the Theatro Municipal do Rio de Janeiro March 20. Jason Reed / Reuters / Landov Obama, Michelle, and their daughters Malia and Sasha watch a drum and martial arts performance by children during their tour of the Ciudad de Deus Favela neighbourhood in Rio de Janeiro March 20. Jason Reed / Reuters / Landov Obama practices his soccer dribbling abilities as he plays with local children during his tour of the Ciudad de Deus Favela in Rio de Janeiro, Brazil, Sunday, March 20. Pablo Martinez Monsivais / AP Photo Obama, left, introduces his family to Brazilian President Dilma Rousseff as they arrive at Palacio do Alvorada in Brasilia, Brazil on Saturday. Susan Walsh / AP Photo Obama and Rousseff stop for a photo at Palacio do Itamaraty in Brasilia, Brazil. Susan Walsh / AP Photo Brazilian President Dilma Rousseff shares a toast with Michelle Obama during the official lunch at the Palacio do Itamaraty. Pablo Martinez Monsivais / AP Photo Obama and Rousseff during their meeting with US-Brazil CEO Forum. Pablo Martinez Monsivais / AP Photo Obama with Rousseff during their joint news conference. Pablo Martinez Monsivais / AP Photo Michelle Obama applauds as she attends cultural performances with her daughter Malia and Sasha at Oca da Tribo restaurant in Brasilia. Silvia Izquierdo / AP Photo Michelle Obama speaks with youths at Oca da Tribo restaurant as her daughter Sasha looks on in Brasilia. Silvia Izquierdo / AP Photo The Obamas and Rousseff participate in an arrival ceremony at Palacio do Planalto in Brasilia. Susan Walsh / AP Photo Rousseff stands with the Obamas as they arrive at Planalto Palace for a meeting in Brasilia. Ricardo Moraes / Reuters / Landov Obama reviews troops during an arrival ceremony at Palacio do Planalto prior to meeting with Brazilian President Dilma Rousseff in Brasilia. Saul Loeb / AFP / Getty Images Obama introduces his family to Lisa Kubiske, Deputy Chief of the U.S. mission in Brazil, as they step off Air Force One in Brasilia on March 19. Jason Reed / Reuters / Landov The first family arrives in Brasilia. Pablo Martinez Monsivais / AP Photo Primary school students hold Brazilian and U.S. flags as they await the arrival of Obama at Planalto Palace in Brasilia on March 19. Ricardo Moraes / Reuters / Landov The Obamas head towards Air Force One, for a flight to Brazil, at Andrews Air Force Base, Md., March 18. Cliff Owen / AP Photo Kids wave a Brazilian and a U.S. flag at the slum of Cidade de Deus. Jadson Marques / Agencia Estado via AP Images Activists of left parties protest against Obama's visit prior to his arrival. Agencia Estado via AP Images Activists of left parties protest against Obama's visit prior to his arrival. Agencia Estado via AP Images