Hillary Rodham Clinton

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Democratic presidential candidate Hillary Rodham Clinton peers over a podium while addressing an audience during a campaign stop at Trident Technical College, Wednesday, June 17, 2015, in North Charleston, S.C. (AP Photo/David Goldman) ** FILE **

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Democratic presidential candidate Hillary Rodham Clinton listens to a question from the audience during a campaign stop at Trident Technical College, Wednesday, June 17, 2015, in North Charleston, S.C. (AP Photo/David Goldman) ** FILE **

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Democratic presidential candidate Hillary Rodham Clinton steps onstage to address an audience at Trident Technical College during a campaign stop Wednesday, June 17, 2015, in North Charleston, S.C. (AP Photo/David Goldman)

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Hillary Rodham Clinton, who on Wednesday will make her second visit to South Carolina, moved early and forcefully to shore up support of black voters, but that Democratic bloc has yet to coalesce behind her. That includes young blacks who say they have lost faith in politics after their experience with President Obama. (Associated Press)

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Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton speaks to Frederic Hunt, minister of the First Calvary Baptist Church, Wednesday, May 27, 2015, at The Main Street Bakery, May 27, 2015, in Columbia, S.C. (AP Photo/Richard Shiro) (credit)

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lead in: Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton speaks to South Carolina House Democratic Women's Caucus and Women's Council, Wednesday, May 27, 2015, in Columbia, S.C. (AP Photo/Richard Shiro) (vtredit)

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Democratic presidential candidate Hillary Rodham Clinton smiles as she is introduced before addressing an audience during a campaign stop at a Flag Day dinner, Monday, June 15, 2015, in Manchester, N.H. (AP Photo/Steven Senne)

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Because Hillary Rodham Clinton used a private email server rather than the government's, she decided what emails were "official" communications that she would turn them over to the State Department. She has since scrubbed the server clean. (Associated Press)

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Democratic presidential candidate Hillary Rodham Clinton winks at a supporter following a rally, Sunday, June 14, 2015, in Des Moines, Iowa. Seeking an army of volunteers, Clinton is trying to build an organizational edge in Iowa as some of her lesser-known Democratic rivals clamor for attention in the state that tripped up her first presidential campaign. (AP Photo/Charlie Neibergall)

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Democratic presidential candidate Hillary Rodham Clinton winks at a supporter following a rally, Sunday, June 14, 2015, in Des Moines, Iowa. Seeking an army of volunteers, Clinton is trying to build an organizational edge in Iowa as some of her lesser-known Democratic rivals clamor for attention in the state that tripped up her first presidential campaign. (AP Photo/Charlie Neibergall)

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Democratic presidential candidate Hillary Rodham Clinton speaks to supporters during a rally, Sunday, June 14, 2015, in Des Moines, Iowa. Clinton's campaign has signaled Iowa will be the centerpiece of its ground game. (AP Photo/Charlie Neibergall)

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Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton, left, hugs her husband former President Bill Clinton after speaking to supporters Saturday, June 13, 2015, on Roosevelt Island in New York. (AP Photo/Frank Franklin II)

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Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton arrives to speak to supporters Saturday, June 13, 2015, on Roosevelt Island in New York. (AP Photo/Julio Cortez)

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Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton, and former President Bill Clinton, right gesture to supporters Saturday, June 13, 2015, on Roosevelt Island in New York. (AP Photo/Frank Franklin II)

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Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton waves to supporters Saturday, June 13, 2015, on Roosevelt Island in New York. (AP Photo/Frank Franklin II)

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Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton gestures before speaking to supporters Saturday, June 13, 2015, on Roosevelt Island in New York, in a speech promoted as her formal presidential campaign debut. (AP Photo/Frank Franklin II) ** FILE **