Format
The exact format for a leaders debate varies, but normally the debate will begin with each leader making a short opening statement. Then a panel of well-known journalists will ask sets of prepared questions, which are to be answered either by all of the leaders or by one specific leader. After the leader(s) answer each question, the other leader(s) may get a chance to make a brief response, after which there may be some time allocated for an often heated "free for all" debate. The moderator will usually attempt to exercise some control through all of this, and then stop the debate after time has elapsed so the next question can be asked. After the panelists finish asking questions, each leader will make his or her closing remarks and the debate will end.
Who gets invited to participate in a leaders debate is often a sensitive issue. Some jurisdictions may have dozens of fringe political parties which few networks would care to have participating in their debates. For the sake of brevity, and to ensure the leaders of the main parties have adequate time to address voters on a wide range of issues, it is extremely rare for any leaders debate to have more than five leaders. A more common number would be three. Leaders debates are often restricted to parties which elected representatives in the previous election. Exceptions may be made for parties with close to a full slate of candidates, but this is not always the case. For example, in Canada in the 2004 and 2006 the Green Party of Canada was excluded from the federal leaders debates until 2008 when public pressure on the other parties allowed the Green Party to join the debate, and the Alberta Alliance was excluded from the Albertan provincial leaders debate, even though both parties had full slates in their respective elections. Parties that are excluded will often complain bitterly about their exclusion, sometimes claiming that the political establishment has conspired in an effort to keep their party on the political fringe. The inclusion of certain parties in debates can be controversial too. A common complaint about the Canadian debates is voiced by a report from the Centre for the Study of Democracy, which calls for the Bloc Québécois, a party only active in mostly French-speaking Quebec, to be removed from its current position in the English-language debates.
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