Congress builds barriers to free trade because workers in the US can't live on $3.00 a day like workers can in the underdeveloped world. The ultimate problem with free trade is simple. The downside of free trade is obvious while the benefits of free trade must be taken on faith. When jobs are lost to foreign countries it is obvious where they went. When wages are decreased because of foreign competition it is obvious why the wages were decreased. New jobs and higher wages created by free trade could have been created for other reasons. You simply can't point to any particular job and say free trade created it. So opponents of free trade have plenty of evidence to use for their position. Defenders of free trade have far less evidence for theirs.
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