I'll agree that McCain won't likely pull the troops out of Iraq and Afghanistan, but we already know he doesn't approve of Gitmo, and his "immigration" policies will raise the taxes more than anyone can imagine. So we can vote for McCain, or we can vote for Obama/Clinton, or we can sit it out. All three will result in the same outcome--with the possible exception of Iraq and Afghanistan.
So you agree it's not the same outcome. That's a start.