BOSTON - Democrat John Kerry (news - web sites) says President Bush (news - web sites) has turned his back on the American worker by allowing other countries to break trade deals negotiated with the United States and that as president he would put in place a "common-sense" effort to strengthen the bargaining and enforcement of such agreements. "When I am president, we will never turn a blind eye to clear trade violations when American jobs are on the line," the presumptive Democratic presidential nominee said in remarks prepared for delivery Sunday evening at a Teamsters labor conference in Las...