As it has been analyzed, the Spaniard Senate suffers a dysfunctional problem: on the one hand it’s established on the 69.1 CE the Senate is the territorial chamber of representatives and on the other one it’s established that it is a sober second thought chamber. At the same time it has been observed that the general elections have driven to symmetrical majorities between the House of Representatives and the Senate even when the electoral formulas are substantively different. This paper identifies the main reason on the constituency. Through electoral simulations it has been proved that the electoral formula and the simultaneity on time of the elections for the Spaniard Parliament (Cortes Generales) are less influential than the constituency. The scenarios proposed introduce the autonomic community as constituency and shows the psychological effects on the electorate changing the symmetrical majorities on most of the elections
