Wyclef Jean with "If I Was President." It's a bit of a downer, but it's poignant and certainly fits the definition of rebel music, which is what I'm feeling right now. Sedmikrasky suggested it in the comments yesterday, and it was on my short list, so great minds and all that.
Further suggestions are welcome, though I can't promise they will make a post. Maybe I'll do an extravaganza on November 5.