Karzai's unofficial victory was marred by a weekend suicide blast in Kabul, illustrating the dangers still facing the war-weary land.
An American woman and an Afghan girl who was selling books were killed in Saturday afternoon's attack on the city's famous "Chicken Street" shopping strip.
Responsibility was claimed by the fundamentalist Taliban militia, which ruled the country until toppled in late 2001 by a US-led attack.
The two deaths brought to 21 the number of people who have been killed in militant-related violence since the historic election, overshadowing the nation's progress towards a stable democracy.
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