The Assembly was controlled in both houses by the governing Movement for Socialism (MAS-IPSP), elected with a 2/3 supermajority, although some members later separated themselves from the majority.

[7] The latest President of the Senate, elected on 19 January 2010 and serving until her death on 26 October of that year, was Ana María Romero de Campero (MAS-IPSP, La Paz).

Martha Poma Luque (MAS-IPSP, La Paz) was elected the same day to serve as Vice President of the Senate, the first woman de pollera to hold that office.

[12] The Senate has ten legislative commissions (Spanish: comisión legislativa), each with two subordinate committees, whose leadership is chosen annually.

Their current leadership, chosen on 2 February 2011, is as follows: The President of the Chamber of Deputies, elected on 19 January 2010, is Héctor Arce (MAS-IPSP).