Great discussion about free trade at Mankiw's blog. Great comments about how free trade arguments are often one-sided from mainstream economists.
An example from a commenter:
"You can't assume that because the gross amounts of wealth generated by "free trade" are vast that it's improving the lives of ordinary Americans, unless you want to make an elementary logical fallacy on the order of "Because the team is great every member on the team is great." You need to provide *additional evidence* to make that claim, but it's precisely the DETAILS that murder the claims of the free trade proponents and makes them, quite frankly, candidates for remedial classes in critical thinking."