Scotland first got the opportunity to vote in a referendum on proposals for devolution in 1979, and though a majority of those voting voted 'Yes', the referendum legislation also required 40% of the electorate to vote 'Yes' for the plans to be enacted.
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The impeachment procedure was last used in 2010, when Judge Thomas Porteous was removed from office.
In the 13th through 18th centuries, the Republic of Venice elected the Doge of Venice using a multi-stage process that featured random selection and voting which allowed approval of multiple candidates and required a supermajority.
The mayor can veto proposed bills, but the council can override it with a two-thirds supermajority.
Congressman John Linder, the bill sponsor, is considering adding language to H.R. 25 during the 111th Congress that would require a supermajority vote of Congress to exempt any industry from the tax.