attained membership within the Bartolina Sisa Confederation, the country's national women's organization. Chamber of Deputies Election Aiza's first foray into electoral politics came in 2004, when she was nominated to contest a seat on the Ocurí Municipal Council. Although unsuccessful in that endeavor, her name was kept in consideration for other posts, and in 2005, she was nominated for a seat in the Chamber of Deputies in representation of the Movement for Socialism (MAS-IPSP). As a product of its close alliance with the peasant movement, the MAS granted rural trade syndicates ample autonomy to select their own candidates in single-member constituencies. In northern Potosí, where traditional mechanisms of choosing leaders remained common practice, the designation adhered to the principle of rotation: in 2002, the candidate had been from , so for 2005, the union instead opted for Severo Pacaja of Ravelo, accompanied by Aiza of Ocurí as his substitute. The pair jointly contested the country's 41st circumscription and were elected to represent Potosí's Chayanta Province in the lower chamber. In 2009, Aiza was nominated for reelection as a full member of the Chamber of Deputies, a selection almost unheard of within the MAS, which had opted to near-entirely renew its parliamentary lists that cycle. Unlike in 2005, where she ran individually, this time, Aiza was incorporated onto the MAS's electoral list. Although disadvantaged by a bottom placement on the party's slate of candidates, she won nonetheless, owing to Evo Morales's near-eighty-percent victory in Potosí, which garnered the MAS an almost clean sweep of the department's parliamentary delegation. Tenure Shortly after assuming office, Aiza was elected to serve as deputy leader of the MAS caucus in the Chamber of Deputies. Her service as second-in-command to leader Rebeca Delgado lasted until early June, at which point Aiza succeeded Delgado following the latter's surprise resignation. Aiza's own tenure was also cut short in early 2011, after comments she made regarding potential increases in the price of gas drew pushback from her party—the incident reflected simmering tensions in the country after a hike in gas prices the previous year, dubbed the , provoked intense general strikes. In her place, Edwin Tupa was elected to lead the MAS caucus, while Aiza returned to her former position as deputy leader. However, Tupa's own troubles forced him to take an extended leave of absence, leading Aiza to once again assume the post of caucus leader for the