The same day that Obama pledged to move forward on the leftover Bush FTAs, one unionist was killed and dozens were wounded in Panama during protests over Panama's new law that severely weakens labor rights.
Last month, two trade unionists were killed in Colombia. This AFL-CIO blog post puts it in perspective.
There are many reasons to oppose the Colombia and Panama FTAs in their present form. The fact that they would give multinational corporations the ability to exploit the horrible human and labor rights situation in these countries is an important one.