WI: US withdraws military presence from afghanistan after Bin Laden death

What if after killing Osama Bin Laden in 2011, Obama announces that the US will immediately withdraw all US military presence from Afghanistan as a result of killing Bin Laden? What effect would this have on Afghanistan and Obama's reelection chances?
 
The Taliban would (and will) be in Kabul 2 days after we leave. This has been for not, but to be honest outside of killing Bin Laden and other bad guys I'm not sure what could we do? When the Northern alliance was sidelined on 9/10/01 that about killed any ethnic army out. We lost before we started.
 
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