Aside from the mechanics of winner-take-all, the Electoral College, and the use of primaries, third parties are hampered by restrictive ballot access laws that force them to spend the bulk of their resources just to get on the ballot. Such obstacles include the requirement in several states that third party candidates obtain thousands of signatures of registered voters in order to get their candidates listed on the ballot. If they manage to get on the ballot, third party candidates are often not allowed. Socialist Party leader Morris Hillquist said in 1910 that America’s presidential system has a role in hurting third party chances even further down the ticket.

In the United States the ticket handed to the voter contains the names not only of candidates for state legislature or congress, but also for all local and state officers and even for President of the United States. And since the new party rarely seems to have the chance or prospect of electing its candidate for governor of a state or president of the country, the voter is inclined in advance to consider its entire ticket as hopeless. The fear of ‘throwing away’ the vote is thus a peculiar product of American politics, and it requires a voter of exceptional strength of conviction to overcome.” (Ibid 202)

Because of the difficulties third parties face in gaining any representation, third parties tend to exist to promote a specific issue or personality, often an issue which either or both of the major parties may eventually end up co-opting. As a counterexample, H. Ross Perot eventually founded a third party, the Reform Party, but he apparently intended it to exist solely as a vehicle to support himself and his agenda and never intended it to field any Congressional or Governatorial candidates. In 1912, Theodore Roosevelt made a spirited run for the presidency on the Progressive Party ticket, but he never made any efforts to help Progressive congressional candidates in 1914, and in 1916 he supported the Republicans. The next third party candidate to win a major portion of the popular vote was independent Ross Perot, who won 18.87% of the popular vote in the 1992 Presidential election.

There have been few third party governors in the past few decades. The last was Jesse Ventura, a member of the Reform Party and later the Minnesota Independence Party, who governed Minnesota from 1999-2003.

One way in which third parties can influence elections in certain jurisdictions in the United States (notably New York state) is through electoral fusion.