The GOP candidates were asked about which woman they'd chose to be on the bill, since the Treasury has announced that a woman will replace Alexander Hamilton in 2020.

Sen. Rand Paul (R-Ky.) gave Susan B. Anthony as his answer. Sens. Marco Rubio (Fla.) and Ted Cruz (Texas) both chose Rosa Parks, though Cruz said he'd keep Hamilton on the bill and replace Andrew Jackson on the bill instead. Former Florida Gov. Jeb Bush said he'd choose former U.K. Prime Minister Margaret Thatcher, while Wisconsin Gov. Scott Walker picked Clara Barton, the founder of the Red Cross. New Jersey Gov. Chris Christie chose Abigail Adams, the wife of former President John Adams, and Ohio Gov. John Kasich selected Mother Theresa.

Some candidates named members of their family. Former Arkansas Gov. Mike Huckabee said he'd pick his wife, because "who else could possibly be on that money?" Businessman Donald Trump said he'd put his daughter, Ivanka, on the bill -- or Rosa Parks -- and neurosurgeon Dr. Ben Carson said he'd choose his mother.

But former Hewlett-Packard CEO Carly Fiorina, the only woman on the stage, declined to name anyone altogether.

"Honestly, it's a gesture," she said. "It doesn't help to change our history. We've got to recognize that women aren't a special interest group ... This nation will be better off when every woman can live the life she chooses."

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