This was pretty funny, Leno had some "carolers" come out and sing this. Unfortunately, I forgot the last line before I could get it down, so I've "fudged" it. Feel free to correct it if you remember what the line was. This is sung to the tune of "It's beginning to look a lot like Christmas":

It's beginning to look a lot like we've won,
In Afghanistan.
We're droping the bombs in waves,
Onto Osama's caves,
To rid them of the Taliban.

It's beginning to look a lot like they've lost.
Al Qaeda is no more.
But the prettiest sight you'll see,
Is Osama hung from a tree.
'till he is, no more.