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This article may be expanded with text translated from the corresponding article in the Italian Wikipedia. (January 2013)
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Italy has historically had many political parties, although they have usually grouped themselves into two main coalitions of the political left and right. As well as the national parties and coalitions, there are a number of regional parties (especially from the Aosta Valley and Trentino-Alto Adige/Südtirol), many far-left associations, and the Italian Radicals, whose allegiance is liable to change frequently.
This graph shows the results of elections held in Italy from 1946 to today, with the percentages of consensus gathered by the various parties and movements displayed by color. Passing your mouse over the different colored sections will display the name of the grouping and the percentage in the corresponding election. Clicking on a region will direct you to the article on the party or election selected.
The constitution of Italy provides for two kinds of binding referendums.
A legislative referendum can be called in order to abrogate a law totally or partially, if requested by 500,000 electors or five regional councils. This kind of referendum is valid only if at least a majority of electors goes to the polling station. It is forbidden to call a referendum regarding financial laws or laws relating to pardons or the ratification of international treaties.
A constitutional referendum can be called in order to approve a constitutional law or amendment only when it has been approved by the Houses (Chamber of Deputies and Senate of the Republic) with a majority of less than two thirds in both or either House, and only at the request of one fifth of the members of either House, or 500,000 electors or five Regional Councils. A constitutional referendum is valid no matter how many electors go to the polling station. Any citizen entitled to vote in an election to the Chamber of Deputies may participate in a referendum.