Some of the leading contenders in Afghanistan’s presidential election:

ABDULLAH ABDULLAH: Having gained 31 percent of the vote as runner-up to Hamid Karzai in the disputed 2009 elections, Abdullah has an advantage in name recognition and political organization. He was a close aide to the late Ahmad Shah Masood, the Northern Alliance rebel commander famed for his resistance to Soviet occupation and the Taliban. Abdullah has a strong following among ethnic Tajiks in Afghanistan’s north, but his perceived weak support among Pashtuns — Afghanistan’s largest ethnic group at 42 percent — could keep him from gaining a majority of votes, even though he is half-Pashtun.