Transition: Amid the heavyweights on Barack Obama's economic team, his choice for trade rep doesn't measure up. Congressman Xavier Becerra is not only a protectionist, he would compromise U.S. moral authority.Would someone who favors tariffs, backs subsidies and opposes free-trade pacts be the best face to put forward as U.S. trade representative? Not in this case. Becerra's name has apparently been put forward for USTR as a sop to House Speaker Nancy Pelosi. She wants her people in the new administration, and she has always seen to it that the former congressional aide has gotten plum assignments. Becerra, whose district...