Is Obama a threat to security?

I know i'm not voting republican, the only ones i liked were Paul and Huckabee....McCain is just another Bush if you ask me. So we are left with Clinton or Obama. I liked President Clinton, but change can't happen if we elect the same family members in time and time again. I'm left with the choice of Obama, i know he's inexperienced but many presidents with the same experience did quite well. But I hear rumors that he is of Arabic decent, which leads me to think this...what better way to attack America than to have one of our own enemies be elected as president. So this is the question, is he a threat? Is this just yet another way to undermine Americans in a way that we would regret? I'm either looking for reurance or truth. He seems like a smart guy, but the guys who bombed the towers was quite smart as well. So i'm wasting 3 of my yahoo points to get an answer from other Americans, as i'm sure i'm not the only one wanting this question answers. I'd appreciate facts only.