Question: What Presidential election did one of the candidates promote a tax policy that advocated for the gold standard?

Context paragraphs:
Joe the Plumber: Samuel Joseph Wurzelbacher ( ; born December 3, 1973), known as Joe the Plumber, is an American conservative activist and commentator.  He gained national attention during the 2008 U.S. presidential election when, during a videotaped campaign stop in Ohio by then Democratic nominee Senator Barack Obama, Wurzelbacher asked Obama about his small business tax policy.  Obama's response included the statement, "when you spread the wealth around, it's good for everybody."  Obama's response was seized upon by conservative media, and by Obama's rival, Republican nominee Senator John McCain, as an indication that Obama was interested in the redistribution of wealth and had a socialist view of the economy.  Wurzelbacher is a member of the Republican Party.

Benjamin Bristow: Benjamin Helm Bristow (June 20, 1832 – June 22, 1896) was the 30th U.S. Treasury Secretary, the first Solicitor General, an American lawyer, a Union military officer, Republican Party politician, reformer, and civil rights advocate.  Bristow, during his tenure as Secretary of Treasury, is primarily known for breaking up and prosecuting the Whiskey Ring, a corrupt tax evasion profiteering ring that depleted the national treasury, having President Ulysses S. Grant's permission.  Additionally, Bristow promoted gold standard currency rather than paper.  Bristow was one of Grant's most popular Cabinet members among reformers.  Bristow supported Grant's Resumption of Specie Act of 1875, that helped stabilize the economy during the Panic of 1873.  As the United States' first solicitor general, Bristow aided President Ulysses S. Grant and Attorney General Amos T. Akerman's vigorous and thorough prosecution and destruction of the Ku Klux Klan in the Reconstructed South.  Sol.  Gen. Bristow advocated African American citizens in Kentucky be allowed to testify in a white man's court case and that education was for all races to be paid for by public funding.

California Taxpayers Association: The California Taxpayers Association is an advocacy organization in the U.S. state of California founded in 1926 to promote lower taxes in the state.  The association, also known simply as CalTax, serves its members through research and advocacy on significant tax and spending issues in the legislative, executive and judicial branches of government.  CalTax is led by President Teresa Casazza, a certified public accountant with many years of experience working on tax policy.

9–9–9: An Army of Davids: 9–9–9: An Army of Davids, written by Herman Cain and Rich Lowrie and released on May 1, 2012, details the 9-9-9 Plan and traces its history along with Cain and other politicians' promotion of the tax policy during the United States presidential election, 2012.  The text also advocates for the gold standard.

United States Senate election in New York, 2012: The 2012 United States Senate election in New York took place on November 6, 2012, concurrently with the U.S. presidential election as well as other elections to the United States Senate and House of Representatives as well as various state and local elections.  Incumbent Democratic U.S. Senator Kirsten Gillibrand won re-election to her first full term.  Gillibrand was opposed in the general election by Wendy Long (who ran on the Republican and Conservative Party tickets) and by three minor party candidates.  Gillibrand was re-elected with 72% of the vote, by a margin of 46%, the highest margin for any statewide candidate in New York.  Gillibrand performed 9 points better than President Barack Obama did in the presidential race in New York.  She carried 60 out of 62 counties statewide.  There was one debate, held in October 2012 where Gillibrand and Long debated various issues such as the economy, abortion rights, the debt and deficit, foreign policy, jobs, and tax and regulatory policy.  Gillibrand's vote total was the highest since President Lyndon B. Johnson's landslide victory in New York in 1964.

Kevin Hassett: Kevin Allen Hassett is an American economist and the Chair of the Council of Economic Advisers.  He is known for his work on tax policy and for coauthoring the book "Dow 36,000", published in 1999.  Prior to becoming Chair of the Council of Economic Advisers, Hassett was the State Farm James Q. Wilson Chair in American Politics and Culture and Director of Research for Domestic Policy at the American Enterprise Institute, a conservative think tank.  He was John McCain's chief economic adviser in the 2000 presidential primaries and an economic adviser to the campaigns of George W. Bush in the 2004 presidential election and McCain in the presidential election of 2008.  He was among Mitt Romney's economic advisers for the 2012 presidential campaign.

Herman Cain: Herman Cain (born December 13, 1945) is an American author, business executive, radio host, syndicated columnist, and Tea Party activist from Georgia.  He was a candidate for the 2012 U.S. Republican Party presidential nomination.

Council on State Taxation: The Council on State Taxation (COST) is a state tax organization representing business taxpayers, noted by one prominent tax policy expert as the “most influential nongovernmental organization in the state tax policy arena.”  COST is a non-profit trade association based in Washington, D.C. consisting of nearly 600 multistate corporations engaged in interstate and international business.  COST was formed in 1969 as the "Committee on State Taxation" by a handful of companies under the sponsorship of the Council of State Chambers of Commerce, an organization with which COST remains associated.  In 2000, the organization changed its name to "Council on State Taxation".  COST’s objective is to preserve and promote equitable and nondiscriminatory state and local taxation of multijurisdictional business entities.

Income splitting: Income splitting is a tax policy of fictionally attributing earned income of one spouse to the other spouse for the purposes of assessing personal income tax (i.e. "splitting" away the income of the greater earner, reducing his/her income for tax measurement purposes), thus reducing tax rates paid by the spouse who earns more and increasing rates paid by a spouse who earns less (or nothing).

Iranian presidential election debates, 2013: The Iranian presidential election debates, 2013 was held from 31 May to 7 June.  For the 2013 election, the IRIB has approved three televised debates with all candidates, different from last election's format which was person-by-person.  For each question, one candidate was chosen randomly to give his response.  Then, other candidates shared their ideas.  The eight candidates was explained their cultural and political plans during debates.  The debates was focused on such issues as economy, foreign policy, and Iran’s comprehensive talks with the P5+1 group (United Kingdom, China, France, Russia and the United States, plus Germany) over the country’s nuclear energy program.  More than 45,000,000 people world-wide watched the debates according to IRIB.

Supporting paragraphs: 9–9–9: An Army of Davids Herman Cain
Answer: 2012