The prolonged uncertainty about the outcome of a runoff has jeopardized a central part of President Barack Obama's strategy to leave behind a stable state after the withdrawal of most US troops at year's end.
Kerry is meeting today with the candidates, former Finance Minister Ashraf Ghani Ahmadzai and former Foreign Minister Abdullah Abdullah, after discussions yesterday proved inconclusive.
The top American diplomat is looking for a plan acceptable to all that would allow the United Nations to audit extensive fraud allegations in last month's vote.
Extended instability would have more immediate consequences for Afghanistan. If no process is established and both Ghani and Abdullah attempt to seize power, the government and security forces could split along ethnic and regional lines.
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The winner amid the chaos could be the Taliban, whose battle against the government persists despite the United States spending hundreds of billions of dollars and losing more than 2,000 lives since invading the country after the September 11, 2001, terrorist attacks.
Abdullah, a top leader of the Northern Alliance that battled the Taliban before the US-led invasion in 2001, claims massive ballot-stuffing. He was runner-up to Karzai in a fraud-riddled 2009 presidential vote before he pulled out of that runoff, and many of his supporters see him being cheated for a second time.
Kerry's hastily arranged visit appears to have succeeded in its most pressing objective: getting both candidates to pull back from declarations of victory and quieting calls among Abdullah's supporters, powerful warlords included, for setting up a "parallel government."