EL SISTEMA DE PARTIDOS COLOMBIANO HOY. PARTIDOS Y REPRESENTACIÓN EN EL CONGRESO DESPUÉS DE LA REFORMA DE 2003.

The political reform of 2003, has been the most important in electoral matters made after the 1991 Constitution. The phenomena of "microempresas electorales", "operación avispa" and personalization, brought about a need to reform and reorganize the system and political parties with two fundamental changes: the electoral formula and the electoral barrier. Since the adoption of the reform there have been four elections in Colombia, two regional (Assembly and Council in 2003 and 2007) and two national (Senate and House of Representatives in 2006 and 2010), which have had mechanical effects on the party system at both the national and sub-national levels, and have "reorganized" the political forces in each legislature. The overall objective of this paper is to observe the effects of the reforms on the national party system in both the first (2006) and second (2010) wave of elections, specifically about the representativeness of the system, taking into account their context and political situation. We conclude that the change in the electoral formula and the imposition of the electoral barrier managed to reorganize the parties and therefore political competition without affecting system proportionality, as its detractors had claimed. Although this aspect had no significant variation, factors such as electoral density lead to other questions over the Colombian electoral system such as the necessity (or not) to think about a new reform that points to a change in the electoral districts and therefore in the levels of representation of the system. [ABSTRACT FROM AUTHOR]