Help! Please explain to me.

Stephen Morris on Election 2004 on National Review Online
Read this wonderful review of the services which John Kerry, since coming to the Senate in 1985, has rendered to the Vietnamese Communists and their friends in Cambodia; add recall his career promoting the communist line with the VVAW in the early Seventies; then remember his vehement opposition to American intervention in favor of freedom in Indochina dating back to at least 1966; and, please, explain to me what is the difference between John Kerry and a communist?