Abstract
There are many instances in which several elections are held at the same time. Different regional elections in a given country, different state elections in a federation, elections for the European Union parliament in each one of the countries. In addition, we can also observe that elections for different government levels take place simultaneously: elections for a central government and for regional governments in a given country, elections for a federal government and for state governments in a federation, and in some instances even the elections for the European Union parliament coincide with other elections, such as regional or municipal, in some countries (Callander 2005 and Fabre 2010).