The House is expected to vote today on whether to grant “fast track authority” to President Obama’s 12-nation Trans-Pacific Partnership trade deal. Obama has pushed hard for this “legacy-defining achievement,” which would make trade easier for the 40 percent of the global economy represented by these 12 countries. Obama hopes to gain “fast track” authority, which would restrict future congressional approval of the massive trade deal to a yes-or-no vote. Most House Republicans are expected to back this arrangement, as are some Democrats, but the vote is still expected to be very close. The Senate has already approved fast track authority for Obama.