In an election where both major candidates see their unfavorability ratings at an all time high, a few political underdogs wonder if they might have a chance.

Two major third parties, the Libertarian and the Green Party, are fighting for the presidency this year, giving an opportunity to voters who dislike both Donald Trump and Hillary Clinton. The Democratic and Republican candidates each had 58 percent unfavorability ratings in late July according to a Gallup poll.

Former New Mexico Governor Gary Johnson and his running mate, former Massachusetts Governor William Weld, are campaigning for the Libertarian Party. Simply put, the Libertarian Party is socially liberal, with some exceptions. According to their website, the Libertarians are pro-choice, for gay marriage, and against gun control. Their position on the economy, however, is farther right; the party plans to phase out social security and switch to more privatized education and healthcare systems.

Johnson’s plan could appeal to moderates of both major parties, especially Republicans critical of Donald Trump and Mike Pence’s far right stance on social issues.

“I got frustrated with some of my colleagues who don’t recognize civil liberties and don’t seem to agree with getting government out of people’s business,” Nebraska State Senator Laura Ebke told the Omaha World-Herald in June. Ebke is one legislator who switched her party affiliation from Republican to Libertarian.

The Green Party, on the other hand, could best be described as liberal on every side of the spectrum. The party’s nominee, Dr. Jill Stein, and her running mate, human rights activist Ajamu Baraka, are campaigning on a platform of social equality, environmental stability, decentralization of wealth and nonviolence according to their website.

The party has been supportive of Vermont Senator and former democratic presidential candidate Bernie Sanders, with Stein even offering to step down as the party’s nominee so that he could take her place. The party’s platform has found itself to be attractive to some Sanders supporters reluctant to get behind Democratic nominee Hillary Clinton, and said in an open letter that “The Green Party platform, which has been and continues to be shaped through a grassroots democratic process for twenty years, is in line with the values of the Sanders campaign.”

Just because many Americans seem to disapprove of the two major party candidates, however, doesn’t mean that either third party has an easy path to the White House. Historically, the most a third party has done is to fracture the vote of a major party, sometimes helping the other major party to win. The most recent example of this is the case of Ralph Nader, who in 2000 gathered support that could have fallen behind Al Gore, who ultimately lost to George W. Bush.

While the reality of third parties in the two party system of the U.S. may be fairly grim, they are nevertheless important. Americans may never see a Gary Johnson or Jill Stein presidency, but whether they’re swinging the election or giving voters that dislike both Trump and Clinton a home, they could still have a big influence in the race for the presidency.