Mark Sedra provides some good angles on the Karzai problematique (oooh, I hate that word). Conclusion--we gotta dance with the guy we brought to the ball.
Remember when the Bush folks were so upset their first few days with alleged pranks that the out-going Clintonites did--removing keys from keyboards, etc. Well, they must have really wanted to teach the Dems a lesson. Karzai is just one of the many legacies that constrain Obama's choices. Thanks, guys. Nice prank!