As for the false claim that "Ron Paul is the only candidate who has repeatedly spoken out against NAFTA, CAFTA, NAU, SPP, etc... the other two have said nothing!", I urge you to watch the video available at this link: http://www.youtube.com/watch?v=Oy8r5yCLLj4 .
In the video linked to above, Mitt Romney clearly states his opposition to a North American community. He says the idea of a North American community "has no merit whatsoever". Mitt Romney says that if he is president "we will not in any way release our sovereignty or diminish it, either by eliminating borders or checkpoints or by building a super highway or entering into treaties like the Law of the Sea Treaty that removes some of the most important elements of our sovereignty". In the video, Mitt Romney also says "the right way for America to be stronger is not to try and attach some other nation to us or to get cheap labor from next door, it's instead to strengthen our own nation, to invest in technology in productivity".