Mexico's lame-duck President, Carlos Salinas de Gortari, is lobbying furiously to become the first director of the new World Trade Organization. But his job prospects may hinge on the outcome of Mexico's Aug. 21 elections. A clean election and solid win for his Institutional Revolutionary Party would make him a shoo-in, but widespread fraud would mar his credentials. The WTO will be created once 118 nations ratify the General Agreement on Tariffs & Trade. "I can't imagine much resistance," says R.K. Morris, an international affairs expert at the National Association of Manufacturers. "From an American and international economic standpoint, he's been a brilliant president." Salinas still faces one other roadblock: Congress could reject GATT, which faces a yearend deadline for approval.