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An Afghan man casts his vote at a local polling station in Kabul on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (SHAH MARAI/AFP/Getty Images) ( 528682746 )

Afghan residents line up to vote inside a polling station in Kabul on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. Afghanistan's third presidential election brings an end to 13 years of rule by Karzai, who has held power since the Taliban were ousted in a US-led invasion in 2001, and will be the first democratic handover of power in the country's turbulent history. (SHAH MARAI/AFP/Getty Images) ( 528682085 )

An Afghan woman (R) is guided by an official as she puts her finger in ink at a polling station in the northwestern city of Herat on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (Aref Karimi/AFP/Getty Images) ( 528678599 )

An Afghan voter looks from within a crowd of people wanting to vote outside a polling station in Bamiyan on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. Afghanistan's third presidential election brings an end to 13 years of rule by Karzai, who has held power since the Taliban were ousted in a US-led invasion in 2001, and will be the first democratic handover of power in the country's turbulent history. (SHEFAYEE/AFP/Getty Images) ( 528684974 )

Afghan women queue outside a school to vote in presidential elections in the northwestern city of Herat on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (Aref Karimi/AFP/Getty Images) ( 528677880 )

A young Afghan child watches as his mother casts her ballot at a local polling station in Kabul on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. Afghanistan's third presidential election brings an end to 13 years of rule by Karzai, who has held power since the Taliban were ousted in a US-led invasion in 2001, and will be the first democratic handover of power in the country's turbulent history. (SHAH MARAI/AFP/Getty Images) ( 528678350 )

An Afghan policeman frisks men at a check point on the streets of Kandahar on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (JAVED TANVEER/AFP/Getty Images) ( 528683092 )

Afghan President Hamid Karzai, center, walks to the ballot boxes before he casts his vote at Amani high school, near the presidential palace in Kabul, Afghanistan, Saturday, April 5, 2014. Afghan voters lined up for blocks at polling stations nationwide on Saturday, defying a threat of violence by the Taliban to cast ballots in what promises to be the nation's first democratic transfer of power. (AP Photo/Massoud Hossaini) ( APTOPIX Afghanistan Elections )

Election workers sort presidential ballots after a polling station was closed for voting in Kabul on April 5, 2014. Afghans voted in large numbers Saturday to choose a successor to President Hamid Karzai in the country's first democratic transfer of power as US-led forces end their 13-year war. Despite Taliban threats, voting was largely peaceful with long queues in cities across the country as voters cast their ballots at around 6,000 centres under tight security. (WAKIL KOHSAR/AFP/Getty Images) ( 528687501 )

An Afghan woman leaves the booth after casting her vote at a polling station in the northwestern city of Herat on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (Aref Karimi/AFP/Getty Images) ( 528678297 )

Afghan voters queue at a local polling station in the Jamee mosque of Herat on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (Aref Karimi/AFP/Getty Images) ( 528680385 )

An Afghan policeman searches a voter before he enters a polling station to cast his vote in Kandahar on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (BANARAS KHAN/AFP/Getty Images) ( 528678628 )

Afghan voters queue outside a local polling station in Kabul on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (SHAH MARAI/AFP/Getty Images) ( 528678163 )

Afghan voters display their national identity cards as they queue to cast their votes at a local polling station in Kandahar on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (BANARAS KHAN/AFP/Getty Images) ( 528679914 )

Afghan voters queue at a local polling station in the Jamee mosque of Herat on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (Aref Karimi/AFP/Getty Images) ( 528680371 )

Afghan voters wait outside a polling station in Jalalabad on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (Noorullah Shirzada/AFP/Getty Images) ( 528682254 )

Afghan election workers count ballots by the light of a lantern at a polling station in Jalalabad, east of Kabul, Afghanistan, Saturday, April 5, 2014. Across Afghanistan, voters turned out in droves Saturday to cast ballots in a crucial presidential election. The vote will decide who will replace President Hamid Karzai, who is barred constitutionally from seeking a third term. Partial results are expected as soon as Sunday. (AP Photo/Rahmat Gul) ( Afghanistan Elections Photo Gallery )

Afghan women voters crowd outside a local polling station in Kabul on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. (SHAH MARAI/AFP/Getty Images) ( 528681967 )

Afghans vote at a local polling station set up in Jamee Mosque of Herat on April 5, 2014. Afghans braved the threat of Taliban violence to vote for a successor to President Hamid Karzai in a landmark election held as US-led forces wind down their long war. (Aref Karimi/AFP/Getty Images) ( 528680409 )

An Afghan voter looks at the long list of candidates for provincial councils as she gets ready to cast her ballot at a local polling station in Kabul on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. Afghanistan's third presidential election brings an end to 13 years of rule by Karzai, who has held power since the Taliban were ousted in a US-led invasion in 2001, and will be the first democratic handover of power in the country's turbulent history. (SHAH MARAI/AFP/Getty Images) ( 528677943 )

An Afghan voter shows her inked finger after she cast her ballot at a local polling station in Kabul on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. Afghanistan's third presidential election brings an end to 13 years of rule by Karzai, who has held power since the Taliban were ousted in a US-led invasion in 2001, and will be the first democratic handover of power in the country's turbulent history. (SHAH MARAI/AFP/Getty Images) ( 528677907 )

A soldier with the Afghan National Army (ANA) shows off the ink on his finger, proof that he voted, while working in the tactical operations center at Camp Maiwand on April 5, 2014 near Pul-e Alam, Afghanistan. Today, despite threats of Taliban violence, Afghans went to the polls in large numbers to select a successor to current President Hamid Karzai. (Photo by Scott Olson/Getty Images) ( 482919683 )

Soldier with the Afghan National Army (ANA) direct security for the election from the tactical operations center at Camp Maiwand on April 5, 2014 near Pul-e Alam, Afghanistan. Today, despite threats of Taliban violence, Afghans went to the polls in large numbers to select a successor to current President Hamid Karzai. (Photo by Scott Olson/Getty Images) ( 482920061 )

An officer with the Afghan National Army (ANA) helps to direct security for the election from the tactical operations center at Camp Maiwand on April 5, 2014 near Pul-e Alam, Afghanistan. Today, despite threats of Taliban violence, Afghans went to the polls in large numbers to select a successor to current President Hamid Karzai. (Photo by Scott Olson/Getty Images) ( 482920233 )

A soldier with the Afghan National Army (ANA) shows off the ink on his finger, proof that he voted, while working in the tactical operations center at Camp Maiwand on April 5, 2014 near Pul-e Alam, Afghanistan. Today, despite threats of Taliban violence, Afghans went to the polls in large numbers to select a successor to current President Hamid Karzai. (Photo by Scott Olson/Getty Images) ( 482919717 )

An elderly Afghan voter casts his ballot at a local polling station in Kabul on April 5, 2014. Afghan voters went to the polls to choose a successor to President Hamid Karzai, braving Taliban threats in a landmark election held as US-led forces wind down their long intervention in the country. Afghanistan's third presidential election brings an end to 13 years of rule by Karzai, who has held power since the Taliban were ousted in a US-led invasion in 2001, and will be the first democratic handover of power in the country's turbulent history. (SHAH MARAI/AFP/Getty Images) ( 528678334 )

An Afghan election worker, second left, explains the process of elections to voters at a polling station in Kabul, Afghanistan, Saturday, April 5, 2014. Afghan voters lined up for blocks at polling stations nationwide on Saturday, defying a threat of violence by the Taliban to cast ballots in what promises to be the nation's first democratic transfer of power. Partial results are expected as soon as Sunday. (AP Photo/Muhammed Muheisen) ( Afghanistan Elections Photo Gallery )

Election workers show casted ballots as they sort votes at a polling station after it closed in Kabul on April 5, 2014. Afghans voted in large numbers to choose a successor to President Hamid Karzai in the country's first democratic transfer of power as US-led forces end their 13-year war. Despite Taliban threats, voting was largely peaceful with long queues in cities across the country as voters cast their ballots at around 6,000 centres under tight security. (WAKIL KOHSAR/AFP/Getty Images) ( 528688133 )

Afghan election officials count ballot papers at the end of polling in Kandahar on April 5, 2014. Afghans voted in large numbers to choose a successor to President Hamid Karzai in the country's first democratic transfer of power as US-led forces end their 13-year war. (BANARAS KHAN/AFP/Getty Images) ( 528687043 )