The part where he described the way in which we escalated our response. I liked how the president stressed the ways in which we escalated force in response to Gadhafi's actions. Careful escalation of force -- as opposed to some "all out, or nothing" nonsense -- is something I, or any other student of low-intensity conflict, can appreciate.
The part where the president contrasted our speed of response in Libya (31 days) to the response to Bosnia in the 1990s (one year) was a particularly impressive thing to point out.
The part where the president pointed out that we are not China. We cannot afford to remain who we are and take some detached, uber-realist view of the world. We do not just let atrocities happen. (Well, we do. But it's true that it offends Americans, in our psyche, to stand aside when atrocities are taking place.) Values matter to the United States -- even when our interests are unclear. We act on our perceived values and do not always take the kind of cold, calculating approach to things that some foreign policy analysts (myself, often, included) wish we would take.
The president articulated an incredibly broad conception of U.S. interests that basically reserves the right for the United States to intervene wherever we see appropriate. Granted, this president seems committed to building strong international support for any intervention, but still, I am scared to death by the prospect of a world-class military paired with humanitarian interventionists willing to use it wherever they see injustice in the world. Because no matter what else I end up doing in life, some part of me will always be that Ranger platoon leader in Iraq in the fall of 2003.
Overall, though, I think the president did a good job tonight. I think the administration is heading in the direction Zack and I wrote about in our paper today. But the more I think about it, the more #3 makes me angry. There are opportunity costs involved in Libya -- as well as in Afghanistan, and Iraq -- that we still do not have the guts to talk about as a nation.