The U.S. Senate, in a key Thursday vote, moved ahead with legislation to give President Obama fast track authority to negotiate new trade agreements, including the Trans Pacific Partnership that would lower tariffs on U.S. exports to Asia. In supplying the needed votes, however, Sens. Maria Cantwell and Patty Murray, D-Wash., played hardball and extracted a key concession from Republican Senate Majority Leader Mitch McConnell. McConnell will allow a vote in June to renew the U.S.