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US President Barack Obama holds a T-shirt given to him as he toured a research laboratory at the Massachusetts Institute of Technology (MIT), an institution that has been developing cutting edge clean energy technology, in Cambridge, Massachusetts, on October 23, 2009. AFP PHOTO/Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

US President Barack Obama holds a T-shirt given to him as he toured a research laboratory at the Massachusetts Institute of Technology (MIT), an institution that has been developing cutting edge clean energy technology, in Cambridge, Massachusetts, on October 23, 2009.        AFP PHOTO/Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)