Jill Stein (born 1950) is an American physician and candidate for President of the United States in 2012 with the Green Party of the United States. Stein was a candidate for Governor of Massachusetts in the 2002 and the 2010 gubernatorial elections. Stein is a resident of Lexington, Massachusetts and a 1979 graduate of Harvard Medical School. She serves on the boards of Greater Boston Physicians for Social Responsibility and MassVoters for Fair Elections, and has been active with the Massachusetts Coalition for Healthy Communities.

In October 2011, Stein announced her candidacy for the presidential nomination of the Green Party in the 2012 general election.

Stein advocates for the creation of a "Green New Deal", the objective of which would be to employ "every American willing and able to work" to address "climate change...[and the] converging water, soil, fisheries, forest, and fossil fuel crises" by working towards "sustainable energy, transportation and production infrastructure: clean renewable energy generation, energy efficiency, intra-city mass transit and inter-city railroads, “complete streets” that safely encourage bike and pedestrian traffic, regional food systems based on sustainable organic agriculture, and clean manufacturing of the goods needed to support this sustainable economy". The initial cost of the Green New Deal would be funded by various mechanisms, including "taxing Wall Street speculation, off shore tax havens, millionaires and multimillion dollar estates" as well as a 30% reduction in the U.S. military budget. She cites a study of the economic effects of the 1930s New Deal projects by Dr. Phillip Harvey, Professor of Law & Economics at Rutgers School of Law as academic evidence for the Green New Deal.

Gary Earl Johnson (born January 1, 1953) is an American businessman, a former Governor of New Mexico, and the Libertarian Party nominee for President of the United States in the 2012 election. Johnson served as the 29th Governor of New Mexico from 1995 to 2003, as a member of the Republican Party, and is known for his low-tax libertarian views and his regular participation in triathlons.

Johnson founded one of New Mexico's largest construction companies. He entered politics for the first time by running for Governor of New Mexico in 1994 on a fiscally conservative, low-tax, anti-crime platform. He beat incumbent Democratic governor Bruce King by 50% to 40%. He cut the 10% annual growth in the budget: using his gubernatorial veto 200 times during his first six months in office. His use of the veto over his two terms gained him the nickname "Governor Veto".

Johnson sought re-election in 1998, winning by 55% to 45%. In his second term, he concentrated on the issue of school voucher reforms, as well as campaigning for marijuana decriminalization. During his tenure as governor, Johnson adhered to an anti-tax and anti-bureaucracy policy, setting state and national records for his use of veto powers: more than the other 49 contemporary governors put together.Term-limited, Johnson could not run for re-election at the end of his second term.

Willard Mitt Romney (born March 12, 1947) is an American businessman and the presumptive nominee of the Republican Party for President of the United States in the 2012 election. He was the 70th Governor of Massachusetts (2003–07).

The son of Lenore and George W. Romney (Governor of Michigan, 1963–69), he was raised in Bloomfield Hills, Michigan. In 1966, after one year at Stanford University, he left the United States to spend thirty months in France as a Mormon missionary. In 1969, he married Ann Davies, and the couple had five children together. In 1971, he earned a Bachelor of Arts degree in English from Brigham Young University and, in 1975, a joint Juris Doctor and Master of Business Administration from Harvard University as a Baker Scholar. He entered the management consulting industry, which in 1977, led to a position at Bain & Company. Later serving as Chief Executive Officer, he helped bring the company out of financial crisis. In 1984, he co-founded the spin-off Bain Capital, a private equity investment firm that became highly profitable and one of the largest such firms in the nation. His net worth is estimated at $190–250 million, wealth that has helped fund his political campaigns. Active in The Church of Jesus Christ of Latter-day Saints, he served as Ward Bishop and later Stake President in his area near Boston. He ran as the Republican candidate in the 1994 U.S. Senate election in Massachusetts, losing to long-time incumbent Ted Kennedy. In 1999, he was hired as President and CEO of the Salt Lake Organizing Committee for the 2002 Winter Olympics and Paralympics; and he helped turn the fiscally troubled games into a success.

Ross Carl "Rocky" Anderson (born September 9, 1951) served two terms as the 33rd mayor of Salt Lake City, Utah, between 2000 and 2008. He is the Executive Director of High Road for Human Rights. Prior to serving as Mayor, he practiced law for 21 years in Salt Lake City, during which time he was listed in Best Lawyers in America, was rated A-V (highest rating) by Martindale-Hubbell, served as Chair of the Utah State Bar Litigation Section and was Editor-in-Chief of, and a contributor to, Voir Dire legal journal.

As mayor, Anderson rose to nationwide prominence as a champion of several national and international causes, including climate protection, immigration reform, restorative criminal justice, LGBT rights, and an end to the "war on drugs". Before and after the invasion by the U.S. of Iraq in 2003, Anderson was a leading opponent of the invasion and occupation of Iraq and related human rights abuses. Anderson was the only mayor of a major U.S. city who advocated for the impeachment of President George W. Bush, which he did in many venues throughout the United States.