- Chelsea Clinton speaks as her mother U.S. Democratic presidential candidate Hillary Clinton stands with Gabby Giffords and her husband Mark Kelly (R) during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. The New York Times's editorial board endorsed Democrat Hillary Clinton and Republican John Kasich as they seek to become their parties' nominees in the U.S. presidential election, calling Clinton one of the most "deeply qualified presidential candidates in modern history." REUTERS/Brian Snyder
- Chelsea Clinton sits with her mother U.S. Democratic presidential candidate Hillary Clinton and Gabby Giffords during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. The New York Times's editorial board endorsed Democrat Hillary Clinton and Republican John Kasich as they seek to become their parties' nominees in the U.S. presidential election, calling Clinton one of the most "deeply qualified presidential candidates in modern history." REUTERS/Brian Snyder
- U.S. Democratic presidential candidate Hillary Clinton waves to the crowd as she arrives with her daughter Chelsea Clinton, Gabby Giffords and her husband Mark Kelly (R) during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. The New York Times's editorial board endorsed Democrat Hillary Clinton and Republican John Kasich as they seek to become their parties' nominees in the U.S. presidential election, calling Clinton one of the most "deeply qualified presidential candidates in modern history." REUTERS/Brian Snyder
- U.S. Democratic presidential candidate Hillary Clinton arrives at a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. The New York Times's editorial board endorsed Democrat Hillary Clinton and Republican John Kasich as they seek to become their parties' nominees in the U.S. presidential election, calling Clinton one of the most "deeply qualified presidential candidates in modern history." REUTERS/Brian Snyder
- U.S. Democratic presidential candidate Hillary Clinton speaks to the crowd at a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. The New York Times's editorial board endorsed Democrat Hillary Clinton and Republican John Kasich as they seek to become their parties' nominees in the U.S. presidential election, calling Clinton one of the most "deeply qualified presidential candidates in modern history." REUTERS/Brian Snyder
- U.S. Democratic presidential candidate Hillary Clinton speaks as her daughter Chelsea Clinton sits with Gabby Giffords and her husband Mark Kelly during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. The New York Times's editorial board endorsed Democrat Hillary Clinton and Republican John Kasich as they seek to become their parties' nominees in the U.S. presidential election, calling Clinton one of the most "deeply qualified presidential candidates in modern history." REUTERS/Brian Snyder
- Democratic presidential candidate Hillary Clinton speaks at a rally at Iowa State University in Ames, Iowa, Saturday, Jan. 30, 2016. (AP Photo/Andrew Harnik)
- U.S. Democratic presidential candidate Hillary Clinton speaks during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Brian Snyder
- Democratic presidential candidate Hillary Clinton, center, accompanied by former Arizona Rep. Gabby Giffords, second from right, and her husband Mark Kelly, right, arrives for a rally at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016(AP Photo/Andrew Harnik)
- A woman in the audience holds a sign that reads "I'm here for the astronaut" as former Arizona Rep. Gabby Giffords and her husband Mark Kelly, joins Democratic presidential candidate Hillary Clinton for a rally at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016(AP Photo/Andrew Harnik)
- Democratic presidential candidate Hillary Clinton speaks at a rally at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016(AP Photo/Andrew Harnik)
- Democratic presidential candidate Hillary Clinton, right, applauds as her daughter Chelsea Clinton, who gets a hug from Mark Kelly, left, during a rally at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016. (AP Photo/Andrew Harnik)
- Chelsea Clinton gets a hug from six-year-old Lily Salazar at a campaign rally with U.S. Democratic presidential candidate Hillary Clinton at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Brian Snyder
- Democratic presidential candidate Hillary Clinton speaks at a rally at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016. (AP Photo/Andrew Harnik)
- Democratic presidential candidate Hillary Clinton, center, arrives for a rally at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016. (AP Photo/Andrew Harnik)
- Chelsea Clinton arrives for a rally for Democratic presidential candidate Hillary Clinton at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016. (AP Photo/Andrew Harnik)
- U.S. Democratic presidential candidate Hillary Clinton poses for a selfie with a girl after a campaign rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Adrees Latif
- U.S. Democratic presidential candidate Hillary Clinton greets audience members during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Brian Snyder
- A woman in the audience watches U.S. Democratic presidential candidate Hillary Clinton speak during a campaign rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Adrees Latif
- Former U.S. Congresswoman Gabby Giffords (L) introduces U.S. Democratic presidential candidate Hillary Clinton during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Brian Snyder
- Audience members listen as U.S. Democratic presidential candidate Hillary Clinton speaks during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Brian Snyder
- Ten year-old Celia Schrag watches U.S. Democratic presidential candidate Hillary Clinton greet audience members during a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Brian Snyder
- A video introduces U.S. Democratic presidential candidate Hillary Clinton at a "Get Out to Caucus" rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Brian Snyder
- U.S. Democratic presidential candidate Hillary Clinton (C), in red, arrives to a campaign rally with Gabby Giffords (R) and her husband Mark Kelly (L) at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Adrees Latif
- U.S. Democratic presidential candidate Hillary Clinton (C), in red, waves after arriving to campaign rally with daughter Chelsea Clinton, Gabby Giffords (L) and her husband Mark Kelly (R) during a campaign rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Adrees Latif
- A girl reacts as she takes a selfie with U.S. Democratic presidential candidate Hillary Clinton after a campaign rally at Iowa State University in Ames, Iowa January 30, 2016. REUTERS/Adrees Latif
- Visitors line the staircase as Democratic presidential candidate Hillary Clinton, bottom right, speaks at a rally at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016. (AP Photo/Andrew Harnik)
- Democratic presidential candidate Hillary Clinton speaks at a rally at Iowa State University in Ames, Iowa Saturday, Jan. 30, 2016. (AP Photo/Andrew Harnik)
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