Washington lobbyists for Arab nations find themselves in a precarious spot, as they try to stay a step ahead of the fast-changing events taking place in the Arab world. For many years, Libya, Saudi Arabia, Bahrain, Yemen, Egypt and other countries in the region have relied on Washington's top lobbyists and lawyers, paying them tens of millions of dollars. But some firms are now tacking toward a more progressive stance in light of what has happened , while others are dropping their clients altogether because of the tumult.