third party

Third party, or minor party, is a term used in the United States' two-party system for political parties other than the Republican and Democratic parties.
Third parties are most often encountered in presidential nominations. Third party vote splitting exceeded a president's margin of victory in three elections: 1844, 2000, and 2016. No third-party candidate has won the presidency since the Republican Party became the second major party in 1856. Since then a third-party candidate won states in five elections: 1892, 1912, 1924, 1948, and 1968. 1992 was the last time a third-party candidate won over 5% of the vote and placed second in any state.

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