Read this Paul Krugman column in the New York Times from this past weekend. He exposes how the defenses of the TPP offered by its supporters don't answer the charges made against it by its opponents:
The administration’s main analytical defense of the trade deal came earlier this month, in a report from the Council of Economic Advisers. Strangely, however, the report didn’t actually analyze the Pacific trade pact. Instead, it was a paean to the virtues of free trade, which was irrelevant to the question at hand. . . .
Instead of addressing real concerns . . . the Obama administration has been dismissive, trying to portray skeptics as uninformed hacks who don’t understand the virtues of trade. But they’re not: the skeptics have on balance been more right than wrong about issues like dispute settlement . . . .