The Czech Constitutional Court has ruled that the country’s current electoral system does not adequately fulfil the constitution’s requirement of being in accordance with “the principles of proportional representation” (article 18 of the Czech constitution). The 200 members of the Chamber of Deputies are currently elected under Flexible List-PR in 14 districts ranging in magnitude from 5 to 26, with a nationwide threshold of 5% for parties and 10% for alliance lists. The Constitutional Court struck down the districting scheme on the grounds that it disadvantages small parties, as well as the 10% threshold for lists of more than one party.
As an election is scheduled for October, Parliament will have to agree fairly quickly on a new districting scheme to replace the one the Court has struck down. Unusually, since the Senate usually only has a suspensive veto the Chamber of Deputies can override immediately by absolute majority, article 40 of the constitution requires the electoral law to be approved by consent of both houses.
What is somewhat ironic is that the case was brought to the Supreme Court by a group of 21 members of the Senate, a house which is not required to be elected by PR and is instead elected by runoff in single-seat districts (with elections to the Senate being fairly low salience and *very* low turnout, it has seen some success by minor parties despite the system’s lack of proportionality).