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Newt Gingrich

Occupation: Author, speaker, documentary film producer

Key issues: Flat tax; zero capital gains tax; reduce government size and spending by applying modern management theory; repeal of the Dodd-Frank Act

Total funds raised: $2.9 million

Business background: Sweeping measures to right-size the federal government and lower taxes that he introduced as Speaker of the House in the 1990s foundered on the realities of Washington politics. Now he's advocating management techniques to streamline federal bureaucracy.

Photo: Chris McKay | Getty Images