To vote, or not to vote..

A crisis. Should I vote or should I just watch.

In one hand, I'm an eligible American citizen and want to join in deciding the next president.
On the other hand, i think i read somewhere dual citizens can only vote for one nation. Something about, it can cause two countries to wage war if the dual citizens intentionally vote for two leaders that hate each other. But I wont do that. Not intentionally at least.

It's not like I'm busy tomorrow. Only 2 classes in the afternoon.
But if i do decided to vote, who should it be? Obama or McCain?

I'll sleep on it..