U.S. President Barack Obama, first lady Michelle Obama, and Brazil's President Dilma Rousseff take part in an arrival ceremony at Planalto Palace in Brasilia
U.S. President Barack Obama and first lady Michelle Obama (L) are pictured through an honour guard as they take part in an arrival ceremony at Planalto Palace with Brazil's President Dilma Rousseff (R) in Brasilia, March 19, 2011. REUTERS/Kevin Lamarque (BRAZIL - Tags: POLITICS IMAGES OF THE DAY)
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