Democratic presidential candidate Hillary Clinton speaks at her first-in-the-nation presidential primary campaign rally on Tuesday in Hooksett, N.H. Matt Rourke/AP hide caption

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Bernie Sanders, Hillary Clinton, center, and Martin O'Malley on stage at the Democratic presidential primary debate Saturday at Saint Anselm College in Manchester, N.H. Jim Cole/AP hide caption

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Hillary Clinton speaks at the Democratic National Committee's summer meeting in Minneapolis, where she was trying to court all-important party delegates to her side. Jim Mone/AP hide caption

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President Obama walks to the podium at his 2008 nominating convention. Lawmakers are inserting into the spending bill a provision allowing political parties to collect up to $97,200 from each donor to pay for their conventions. Chuck Kennedy,Scott Andrews/AP hide caption

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