See
http://www.youtube.com/watch?v=RA-NzSZl0kAI watched this and saw that Greg Palast is concerned that Gore hasn't likely changed his views on NAFTA since he was a proponent of it in 1993 in a debate with Ross Perot and later in 2000 on his candidate website he mentioned it as one of the issues he'd supported in the past.
Palast is mainly concerned that the WTO and NAFTA later became things that seem to be causing problems internationally regarding loss of jobs and exploitation of foreign nations and their workers.
A friend tells me that he thinks Palast hasn't taken into consideration that many of Gore's opinions have changed since 2000 when he went into an introspective period reviewing his beliefs.
Also my friend says that Gore is not responsible for the massive changes that have been added to the NAFTA agreements since Bush took office that have led us to the current situation. Palast details in his book some horrible excesses in government that seem related to NAFTA and WTO, such as exploitation of other countries and of course we all know about our loss of local jobs. He discussed incidents in Argentina where British and U.S. firms seem to have actually purchased the WATER SYSTEM of Argentins (which, as is increasingly the case even in the U.S. with our utility companies, is privatized, not owned by the public like it should be) and hiked up the price rates so that citizens of the land couldn't even afford their own country's water. I am not the most knowledgeable on the subject of everything that Palast dislikes about NAFTA, but those of you who read his books can check that out.
Palast is a liberal author, not one of the neocons out to sandbag Democrats. He just has a problem about NAFTA. Maybe someone can figure out if Gore has ever said anything about that topic in the past 3 years now that so much has changed or if he's still a big proponent of this globalization of jobs and the consequences.