Why Does Syria Need Two Ambassadors in Washington?

Lebanon and its puppet government. From Why Does Syria Need Two Ambassadors in Washington?:

Syria maintains not one but two ambassadors to Washington. Officially, Syrian president Bashar Assad's top diplomat in the U.S. is Ambassador Imad Moustapha. Assad's second, unofficial - but reliably pro-Syria - envoy is Lebanon's ambassador to Washington, Farid Abboud. Abboud, who has been in Washington for eight years, was appointed by the pro-Syria Lebanese president Emile Lahoud. As a matter of policy, the administration has treated Abboud as a Syrian official
and has studiously avoided contact. The absence of a Lebanese ambassador to Washington who is accountable to his own government reflects the ongoing Syrian influence in Lebanon.