Hillary Rodham Clinton

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Supporters walk off after listening to former Secretary of State Hillary Rodham Clinton speak this weekend in Indianola, Iowa. (Associated Press photographs)

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contender: Former Secretary of State Hillary Rodham Clinton speaks at retiring Iowa Sen. Tom Harkin's annual steak fry. Her trip to the Hawkeye State fuels already-rampant speculation as to her 2016 ambitions. (Associated Press)

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Then-Secretary of State Hillary Rodham Clinton, and former President Bill Clinton, listen to speakers in Washington in this Jan. 14, 2011, file photo. (AP Photo/Carolyn Kaster, File)

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Voters are beginning to discover that Hillary Rodham Clinton walks in sensible shoes rather than upon water these days, and it's reflected in the polls. (associated press)

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National Edition News cover for September 10, 2014 - On issues of the day, Clinton is everywhere and nowhere: Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y., is reflected by a fire engine as she speaks at a campaign stop at the Denison Fire Department in Denison, Iowa, Thursday, Dec. 27, 2007. (AP Photo/Jeff Chiu)

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Former Secretary of State Hillary Rodham Clinton, right, takes questions from John Podesta, counselor to President Barack Obama, at the National Clean Energy Summit Thursday, Sept. 4, 2014, in Las Vegas. (AP Photo/John Locher)

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trailblazers: Prominent figures like House Minority Leader Nancy Pelosi and likely 2016 presidential candidate Hillary Rodham Clinton haven't led to more women running for office. (Associated Press)

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Sen. Rand Paul said former Secretary of State Hillary Rodham Clinton's war record is likely to give independents and even some Democrats pause at the thought of supporting her in 2016.

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President Clinton waves with first lady Hillary Rodham Clinton as they arrive at the docks in Menemsha, Mass. for an afternoon of sailing with Kennedy family members off the coast of Martha's Vineyard Wednesday Aug. 20, 1997. (AP Photo/Ruth Fremson)

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President Clinton and first lady Hillary Rodham Clinton rest on a hammock near the shore of Beaver Lake near Springdale, Ark., on Tuesday, Aug. 17, 1993. The first family is spending a few days in northwest Arkansas before returning to Washington and more vacation time in Martha's Vineyard, Mass. (AP Photo/Mike Stewart)

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Former U.S. Secretary of State Hillary Rodham Clinton, and former President Bill Clinton, listen to speakers in Washington, Jan. 14, 2011. (Associated Press) ** FILE **

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President Barack Obama stands with then-Secretary of State Hillary Rodham Clinton as he announces that she will travel to Myanmar, on the sidelines of the ASEAN and East Asia summit in Nusa Dua, on the island of Bali, Indonesia, Friday, Nov. 18, 2011. (AP Photo/Charles Dharapak) ** FILE **

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Former Secretary of State Hillary Rodham Clinton holds her memoir "Hard Choices" at Bunch of Grapes Bookstore, in Vineyard Haven, Mass., on the island of Martha's Vineyard, Wednesday, Aug. 13, 2014, during a book signing event for her memoir "Hard Choices." Hillary Rodham Clinton says she's looking forward to hugging out her differences with President Barack Obama. Obama's former secretary of state told reporters Wednesday that she's proud to have served with him despite some differences of opinion. (AP Photo/Steven Senne)

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Former Secretary of State Hillary Rodham Clinton holds her memoir "Hard Choices" at Bunch of Grapes Bookstore, in Vineyard Haven, Mass., on the island of Martha's Vineyard, Wednesday, Aug. 13, 2014, during a book signing event for her memoir "Hard Choices." Hillary Rodham Clinton says she's looking forward to hugging out her differences with President Barack Obama. Obama's former secretary of state told reporters Wednesday that she's proud to have served with him despite some differences of opinion. (AP Photo/Steven Senne)

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First lady Hillary Rodham Clinton points to her Chicago Cubs baseball cap as she and President Clinton leave the White House Saturday, Oct. 3, 1998 on their way to Camp David. (AP Photo/Wilfredo Lee)