The road to the White House is going to be a bumpy one in 2016 with candidates from both parties needing to grapple with solutions to the country's biggest problems. Brendan Smialowski/AFP/Getty Images hide caption

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President Obama, flanked by Secretary of State John Kerry (right) and Vice President Joe Biden, announced the Keystone XL pipeline decision Friday in the Roosevelt Room of the White House. Mandel Ngan/AFP/Getty Images hide caption

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Vice President Joe Biden announces he will not seek the 2016 Democratic presidential nomination during an appearance in the White House Rose Garden with President Obama and Dr. Jill Biden. Carlos Barria/Reuters/Landov hide caption

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President Obama talks with Texas high school student Ahmed Mohamed during the White House's Astronomy Night event on the South Lawn Monday night. Chip Somodevilla/Getty Images hide caption

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Republican presidential candidate Carly Fiorina walks the streets of Manchester, NH with Mayor Ted Gastas. Gastas has also campaigned with three other GOP candidates this year. Brady Carlson/New Hampshire Public Radio hide caption

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U.S. and South Korean soldiers of the combined 2nd Infantry Division train at Camp Red Cloud in Uijeongbu, South Korea. Elise Hu/NPR hide caption

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The damaged hospital in which the Doctors Without Borders medical charity operated is seen following a U.S. airstrike in the northern city of Kunduz. STR/AFP/Getty Images hide caption

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The tables are set in the State Dining Room of the White House for Friday's state dinner honoring visiting Chinese President Xi Jinping. Manuel Balce Ceneta/AP hide caption

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President Barack Obama and Pope Francis stand at attention during the playing of the national anthems during a state arrival ceremony for the pope on the South Lawn of the White House Wednesday. Pablo Martinez Monsivais/AP hide caption

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