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In electoral politics, a third party is ''any'' party contending for votes that failed to outpoll either of its two strongest rivals (or, in the context of an impending election, is considered highly unlikely to do so). The distinction is particularly significant in two-party systems. In any case "third" is often used figuratively, as in "the third parties", where the intent, literally stated, is "the third and succeeding parties". For instance, in the United Kingdom a third party is a national political party, other than the Conservatives and Labour, which has at least one member in the House of Commons. Since 2015, it is used for the Scottish National Party. In Scotland the dominant parliamentary party since 2007 has been the Scottish National Party with the Labour party the next largest party and the Conservative party third. In the United States of America, there have been numerous "third parties". The largest since the mid-20th century are the Libertarian and Green Parties. The term "third parties" is used mostly in countries with first past the post electoral systems, as those systems tend to create a two-party system, so that successful smaller parties are rare. Countries using proportional representation give little advantage to the largest two parties, so they tend to elect many parties. Therefore, in those countries, three, four, or more political parties are usually elected to legislatures. In such parliamentary systems, coalitions often include smaller parties; since they may participate in a coalition government, there is not a sharp distinction with a 'major' party. In two-party systems, on the other hand, only the major parties have a serious chance of forming a government. Similarly, in presidential systems, third-party candidates are rarely elected president. In some categorizations, a party needs to have a certain level of success to be considered a third party. Smaller parties that win only a very small share of the vote and no seats in the legislature often are termed minor or fringe parties. == United States == (詳細はU.S. politics, a third party is a political party other than the Democrats or Republicans, such as the Libertarians and Greens. The term "minor party" is also used in a similar manner. Such political parties rarely win elections, as proportional representation is not used in federal or state elections, but only in some municipal elections. A similar situation occurs with the presidential Electoral College, where Electoral College votes are often given the candidate who receives a plurality of the vote, thus bringing up accusations that certain third party presidential candidates are "spoiling" the election or splitting up segments of voters. Among the other challenges that third parties face in the United States, is the frequent exclusion from major debates and media coverage, denial of ballot access and the difficulty in raising campaign contributions large enough to compete with the two major political parties. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Third party (politics)」の詳細全文を読む スポンサード リンク
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