Hillary Clinton speaks at an event in New Hampshire earlier this month. The presidential candidate continues to face questions over her emails as secretary of state.
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Hillary Clinton waits behind a curtain before a rally at the University of Wisconsin, Milwaukee on Thursday. She continues to struggle to explain her use of a private email server while secretary of state.
Demonstrators march in the snow outside the White House during a rally against the Supreme Court's decision five years ago in favor of Citizens United, which allows private citizens and corporations to make unlimited donations for political campaigns.
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A man carries a cardboard cutout of Hillary Clinton in Des Moines, Iowa. Clinton and other traditional candidates have struggled to breakthrough as outsiders have captured the attention this summer.