"Same goes for everyone in the world who has or will suffer because of George Bush and the US government."

In this sentence there is more than one possible way to interpret what is being said. There is the meaning I had in mind, that I am including only those people who, among all of the people in the world, has or will suffer because of George Bush and the US government. I gave an examiple of that meaning with this sentence, "I feel sorry for that guy who just died in a car accident. Same goes for everyone else who has or will die in a car accident". With this example, it should be pretty clear to most people that I am talking about a specific group of people, ie: those who have or will die in car accidents.

In this example, "Same goes for everyone in the world, who has or will suffer because of George Bush and the US government". The comma after "world" could be used to separate the two parts of the sentence. ie: Same goes for everyone in the world. Everyone in the world has or will suffer because of George Bush and the US government.

As I said, it would be quite a stetch to get that meaning out of my sentence, even with the comma.