Each of the 26 state governors must achieve more than 50% of the vote, including a second round run-off between the top two candidates if necessary. In contrast to the federal level, state legislatures are unicameral, although the deputies are elected through similar means, involving an open-list system in which the state serves as one constituency. State level elections occur at the same time as those for the presidency and Congress. In 2002, candidates from eight different parties won the gubernatorial contest while 28 parties are represented in the country's state legislatures. The last set of elections took place in 2006.