Front for Victory
Pampuro was elected to the Senate on the Front for Victory slate alongside Cristina Fernández de Kirchner in the 2005 mid-term elections, in which the center-left Front for Victory did well. He was elected Provisional President of the Senate on 22 February 2006, putting him second in line to the presidency, and twice as President of the Mercosur Parliament (during the first half of 2008 and the first half of 2010).