President Barack Obama meets with Colombian President Juan Manuel Santos in the Oval Office of the White House in Washington, Tuesday, Dec. 3, 2013. President Barack Obama says there has been a 20 percent increase in trade between the U.S. and Colombia since the two countries signed a free trade agreement during his first term. The two leaders are holding talks focused on growing the economic relationship between their countries. (AP Photo/ Evan Vucci)
FILE - In this Nov. 17, 2011 file photo, Onyango Obama, uncle of President Barack Obama, leaves Framingham, Mass., District Court, after a hearing on an August drunk driving charge. Obama, the 69-year-old half brother of the president's late father, faces a deportation hearing Tuesday, Dec. 3, 2013, in Boston. He has lived in the United States since the 1960s. He was ordered to leave the country in 1992, but remained. (AP Photo/MetroWest Daily News, Ken McGagh, File) MANDATORY CREDIT
FILE - This Nov. 29, 2013 file photo shows part of the HealthCare.gov website, photographed in Washington. President Barack Obama's new and improved health care website will face its next big test when a year-end enrollment crunch is expected to hit in a couple of weeks. Until now the main damage from technology woes has been to Obama's poll ratings, but it will be average Americans feeling the consequences if HealthCare.gov chokes in coming weeks. (AP Photo/Jon Elswick)
London Mayor Boris Johnson, a maverick member of the center-right Conservative Party, sees Sen. Barack Obama as the "incarnation of change and hope" that the United States needs in the White House.