 He was elected a member of the Constitutional Assembly on September 30, 2007, as a candidate of the alliance between the social-democratic "Izquierda Democrática" (Party of the Democratic Left), the Poder Ciudadano Movement, and two other democratic socialist movements, "Acuerdo Democrático" and "Nuevo Acuerdo Nacional".He was elected as the first candidate in the Province of Pichincha, which includes the capital city of Quito.Before forming "Movimiento Poder Ciudadano", Borja was a national leader of "Movimiento Nuevo País" (New Country Movement), where he was an adviser to Presidential candidate Freddy Ehlers, as well as alternate representative from Ecuador to the Andean Parliament.