A look at third-party candidates in the 2012 presidential election.
Background: Former Democratic two-term mayor of Salt Lake City, Utah.
Platform: End foreign wars and war on drugs, single-payer health care for all, campaign finance reform
Background: Former Virginia Congressman who switched from Democrat to Republican.
Platform: Moratorium on foreign workers until unemployment falls below 5 percent; Congressional term limits; anti-superPACs; eliminate foreign aid; supports gun rights; anti-abortion; anti gay marriage.
Background: Former two-term Republican governor of New Mexico
Platform: Legalizing marijuana, pro-choice, same-sex marriage, balancing the federal budget, ending wars.
Background: Physician from Lexington, Mass.; ran against Romney for governor in 2002.
Platform: Free public higher education, Medicare for all, same-sex marriage, abolish electoral college