Afghan presidential race: Ahmadzai and Sayaff vying to win

Afghans go to the polls on Saturday to vote in what may be their most crucial election, the presidential race to replace Hamid Karzai.

Despite Taliban threats, large numbers of Afghans have been turning out for rallies across the country for candidates ranging from technocrats to warlords from the past.

Lyse Doucet reports on two different candidates vying to be president.