He doesn't come right out and say it, but the arguments Rep. David Obey (D-WI) makes in this Huffington Post op-ed piece lead one to the conclusion that we must get out of Afghanistan, and soon. From the piece:
At the height of the Soviet occupation of Afghanistan, they had 100,000 troops on the ground - which is what we would have if General McChrystal's reported recommendations are approved. I was shocked at how openly Soviet leaders would admit that the very fabric of their political system was being devoured by their misadventure in Afghanistan. I saw what it did to their country. We are a much richer and a much stronger country then they were, but we would still pay a price that is far too high.
The rest of the piece, backed by logical argument and supporting data, paints an all around bleak picture of the situation in Afghanistan. And goes further to suggest that going with McChrystal's recommendations will make it worse.