As the first votes of the primary season approach, the BBC looks at the Republican candidates hoping to stand against President Barack Obama in November.
The Minnesota congresswoman is an outspoken favourite of the Tea Party who rose to prominence with her strident cable television attacks on President Barack Obama and the Democrats.
Ms Bachmann built her campaign from a small core of staunch supporters and briefly led in the polls in the early caucus state of Iowa before falling into the second tier of candidates.
A devout evangelical Christian, Ms Bachmann has a law degree and worked as a tax attorney. Before her election to the House in 2006, she was a state senator in Minnesota.
On the campaign trail, she refers frequently to her five children and the 23 young women she took into her home as a foster mother.
Would reduce the corporate income tax rate, cut "non-security discretionary spending" by 5% and "tear down the vast edifice of regulations the Obama Administration has imposed on the economy"
Healthcare
Would repeal Barack Obama's 2010 healthcare overhaul, even though it is conceptually similar to a plan he support in Massachusetts; would encourage individuals to purchase their own health insurance rather than rely on their employers
Immigration
Would make English the official language of the US and "turn off the magnets like tuition breaks or other breaks that draw people into this country illegally"
National security
"It's worth working with the insurgents in the country to encourage regime change in the country. And if all else fails, if after all the work we've done there's nothing else we can do besides take military action then of course you take military action. It is unacceptable for Iran to have a nuclear weapon"
Social issues
Would defend a US law barring federal recognition of same-sex marriages; supports allowing states to ban abortion
Economy
Would cap federal spending at 18% of GDP, which the campaign says is the average since 1960, and replace the complicated income tax code with a 20% flat rate
Healthcare
Would repeal Barack Obama's 2010 healthcare overhaul
Immigration
Has been criticised for his support in Texas for offering children of illegal immigrants the same low university tuition rates as native-born Texans; has suggested using Predator Drones to patrol the US-Mexico border; says a fence along the entire border "does not make sense"
National security
Would deploy thousands of soldiers to the US border with Mexico
Social issues
Supports a "human life amendment" to the US constitution and an amendment barring same-sex marriage
Economy
"9-9-9" plan calls for a flat 9% individual income tax, a 9% corporate income tax, and a 9% national sales tax
Healthcare
Would repeal Barack Obama's 2010 healthcare overhaul
Immigration
"We should secure the border for real, and it would be a combination of a fence, technology, as well as possibly boots on the ground for some of the more dangerous areas"
National security
"The first thing that I would do is to assist the opposition movement in Iran, that's trying to overthrow the regime"; Would deploy warships to the Persian Gulf
Social issues
"I believe in life from conception, period. No exceptions. I believe that marriage is between one man and one woman and... I would have asked the Department of Justice to enforce the Defense of Marriage Act"
Economy
Would reduce corporate income tax rates; opposes increases in the US debt limit
Healthcare
Would replace Barack Obama's 2010 healthcare overhaul with a system of individual health insurance plans
Immigration
Calls for a fence along the entire US-Mexico border and will "enforce" English as the official language of the US government
National security
"We have a President who devalues the special relationship with our most trusted ally, Britain, even as he bows to kings, bends to dictators, bumbles with reset buttons, and babies radical Islamists"
Social issues
Strongly opposes same-sex marriage and is fiercely anti-abortion
Economy
Would veto any "unbalanced" budget; refuse to raise the US borrowing limit; and eliminate the income, capital gains, and estate taxes, and cut $1tr (£633.6m) from the annual federal budget
Healthcare
Would repeal Barack Obama's 2010 healthcare overhaul; "the answer to it is turn it back over to the patient and the doctor relationship with medical savings accounts"
Immigration
Would "abolish the welfare state" to discourage illegal immigration and end automatic citizenship for everyone born in the US
National security
Openly questions his rivals' aggressive talk on Iran and calls concerns about Iran's nuclear programme "propaganda" aimed at building support for another US war
Social issues
Supports allowing states to ban abortion and legislation "defining life as beginning at conception"; supports policy measures to facilitate homeschooling
Economy
Would eliminate the current system of income tax deductions and credits and lower individual and corporate tax rates; would eliminate capital gains taxes
Healthcare
Would repeal Barack Obama's 2010 healthcare overhaul, then consult with governers on a replacement, and says "we need to do a better job in harmonizing medical records"
Immigration
Has said it would be unrealistic to deport all 12m estimated illegal aliens in the US
National security
Questions the "ill-advised counterinsurgency campaign" in Afghanistan; calls for a "sober-minded" assessment of US commitments abroad
Social issues
Supports same-sex civil unions, but says: "I stand tall and proud for traditional marriage. You can't re-open the definition of marriage, that would not be a good thing"; favours a constitutional ban on abortion
Economy
Would make permanent Bush-era individual income tax cuts; eliminate the capital gains tax; reduce the corporate income tax rate; and establish an "optional" 15% flat income tax
Healthcare
Would repeal Barack Obama's 2010 healthcare overhaul and offer in its place tax benefits to encourage the purchase of private health insurance
Immigration
Would make English the official language of the US and favours "100% control" of the US-Mexico border
National security
Calls for "maximum covert operations" to disrupt the Iranian nuclear programme
Social issues
Pledges to grant home-schooling parents access to tax-payer funded extracurricular activities; website vows to "protect the frail, infirm and the elderly from the state's arbitrary decision to terminate life"
Economy
Calls for a 0% tax on the manufacturing industry and on repatriated corporate profits earned overseas
Healthcare
Would repeal Barack Obama's 2010 healthcare overhaul and has said: "I was always for having the government out of the health care business and for a bottom-up, consumer-driven healthcare"
Immigration
Would penalise employers who hire illegal immigrants
National security
"We should be working with Israel right now to do what they did in Syria, what they did in Iraq, which is take out that nuclear capability before the next explosion we hear in Iran is a nuclear one and then the world changes"
Social issues
Would push for a constitutional amendment barring same-sex marriage; while a senator, was a prominent anti-abortion voice
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