As Armenia's first post-Soviet president in the 1990s, Levon Ter-Petrossian brought in top officials from Nagorno-Karabakh to serve in his government. Today, as an opposition leader, Ter-Petrossian is the most outspoken critic of what he and his allies call the "Karabakh clan," lambasting his former proteges for raiding the country's treasury, strangling the economy, and stifling democracy. The main targets of the broadside have been outgoing President Robert Kocharian and his preferred successor, Serzh Sarkisian, the current prime minister who defeated Ter-Petrossian in Armenia's February 19 presidential election. Both Kocharian and Sarkisian hail from Nagorno-Karabakh, an Armenian-controlled and populated enclave...