I thought Obama really nailed his appearance today. This bit was right on:

Here at home, we will strengthen our defenses, but we will not succumb to a siege mentality that sacrifices the open society and liberties and values that we cherish as Americans, because great and proud nations don't hunker down and hide behind walls of suspicion and mistrust.  That is exactly what our adversaries want, and so long as I am president, we will never hand them that victory.  We will define the character of our country, not some band of small men intent on killing innocent men, women, and children.

It was also interesting that he reiterated his view that "We are at war."

We are at war against al Qaeda, a far-reaching network of violence and hatred that attacked us on 9/11, that killed nearly 3,000 innocent people, and that is plotting to strike us again.  And we will do whatever it takes to defeat them.

A lot of conservative commentators, notably Washington Post columnist Charles Krauthammer,  have stated repeatedly without evidence that Obama doesn't think the United States is at war, even though he's said so many times. Well, he said it again.