Obama Attends G20 Summit

Britain's Prime Minister Gordon Brown, left, greets President Barack Obama as he arrives for the G20 summit at the ExCel centre in London, Thursday, April 2, 2009. Leaders of the world's rich and developing countries sought to dispel the clouds over the world's troubled economy -- and clear up divisions over how far to go with tougher financial regulation -- at the crisis summit Thursday.

Summit host British Prime Minister Gordon Brown, front row center, stands with the other G20 leaders during a group photo at the G20 Summit in the ExCel Centre in London, Thursday, April 2, 2009.

Spanish Prime Minister Jose Luis Rodriguez Zapatero, Australian Prime Minister Kevin Rudd and German Chancellor Angela Merkel laugh as President Barack Obama shakes hands with Canada's Prime Minister Stephen Harper during the second family photo at the G20 Summit in London, Thursday, April 2, 2009. The photo was restaged after Harper missed the initial photo-op.

President Barack Obama, left, smiles with Italian Prime Minister Silvio Berlusconi, center, and Russian President Dmitry Medvedev during a group photo at the G20 Summit in the ExCel Centre in London, Thursday, April 2, 2009.

President Barack Obama meets with South Korea's President Lee Myung-bak at the G20 summit at the ExCel Centre in London, Thursday, April 2, 2009.

President Barack Obama, left, talks with South Korea's President Lee Myung-bak at the G20 Summit at the ExCel center in London, Thursday, April 2, 2009.

German Chancellor Angela Merkel smiles as she and President Barack Obama attend a group photo session at the G20 Summit in the ExCel Centre in London, Thursday, April 2, 2009.

President Barack Obama, right, and Treasury Secretary Timothy Geithner, react, during the Plenary Session at the G20 Summit at the ExCel Centre in London, Thursday April 2, 2009.

President Barack Obama, left, speaks with British Prime Minister Gordon Brown during the G20 Summit at the ExCel Centre in London, Thursday, April 2, 2009.

President Barack Obama, left, walks with Dutch Prime Minister Jan Peter Balkenende during a group photo session at the G20 Summit in the ExCel Centre in London, Thursday, April 2, 2009.

British Prime Minister Gordon Brown front center, speaks with Brazil's President Luiz Inacio Lula da Silva during a photo session at the G20 Summit in the ExCel centre in London, Thursday, April 2, 2009. President Barack Obama is upper left.

President Barack Obama, middle row center, smiles as he stands with Turkish Prime Minister Recep Tayyip Erdogan, middle row left, and Russian President Dmitry Medvedev, middle row right, during a group photo session at the G20 Summit in the ExCel centre in London, Thursday, April 2, 2009.

President Barack Obama speaks at the end of the G20 Summit at the ExCel centre, in London Thursday, April 2, 2009.

President Barack Obama gestures during a press conference at the end of the G20 Summit at the ExCel centre in London, Thursday, April 2, 2009.

President Barack Obama points during a press conference at the end of the G20 Summit at the ExCel centre in London, Thursday, April 2, 2009.

President Barack Obama laughs during a press conference at the end of the G20 Summit at the ExCel centre in London, Thursday, April 2, 2009.

The G20 spouses pose for a group picture during their visit to the Royal Opera House, Covent Garden, London, Thursday, April 2, 2009. First lady Michelle Obama is fifth from the left.

First lady Michelle Obama applauds dancers after they performed Giselle on stage during a visit of G20 spouses to the Royal Opera House, Covent Garden, London, Thursday, April 2, 2009.