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* The electoral system is two-round. To avoid a runoff, the winner must win 45 percent of valid votes. Alternatively, she must win 40 percent of valid votes and at least 10 points more than the next-placed candidate.
* One-third of the Senate is renewable every two years.
** One-half of the Chamber of Deputies is renewable every two years. Party lists are closed. There are 24 multi-member districts. The threshold is 3 percent.
Last Updated on 02/04/2010