The Leader of the Opposition reference article from the English Wikipedia on 24-Jul-2004
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Leader of the Opposition

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The Leader of the Opposition is a title traditionally held by the leader of the largest opposition party in a Westminster System of parliamentary government. The Leader of the Opposition is invariably seen as the alternative prime minister to the present incumbent, and heads a rival alternative government known as the Shadow Cabinet or Front Bench.

In Commonwealth Realm monarchies, the full title is Leader of Her Majesty's Loyal Opposition.

See also: