President Obama has used up quite a bit of his political capital lately trying to push through a giant trade pact. And, in an unusual twist, the opposition came from his own party. Democrats voted against fast-tracking of the Trans-Pacific Partnership this week, with Massachusetts Senator Elizabeth Warren leading the charge. Warren told NPR yesterday that the trade deal is basically a gift to corporations. President Obama, meanwhile, said her objections are “speculative.” How did the once close political allies get to this point?