I am also mystified why Obama is pushing the TPP so hard. I'm not surprised that he is for it. It has long been clear that Obama is not opposed to international trade deals. I'm just surprised that he has made it such a high priority when so many of his constituencies hate it.
(Sure the big money folks like it. But at this stage in his presidency he's not looking for donors and is supposed to be more concerned with his legacy. This isn't doing anything to help that.)