There have been a number of indications of this, but this video NATO Secretary-General Anders Fogh Rasmussen posted on his blog seems like the clearest instance yet of the former Danish Prime Minister publicly pressuring Barack Obama to accede to General McChrystal’s troop request:
It’s not clear that this really matters; Rasmussen doesn’t have any relevant formal authority and I’d be surprised if U.S. public opinion turned out to hinge on the views of a Danish politician nobody’s heard of but me. That said, as Spencer Ackerman says it’s a interesting development anyway simply because there doesn’t seem to be any real precedent for this. The way NATO works is that the General or Admiral in charge of U.S. European Command also serves as Supreme Allied Commander, and then a European politician gets the top civilian post. His job is primarily to do cat-herding on the continent and serve as a spokesman for NATO policy, not to weigh-in on live political controversies.