Poll: Clinton Now Trails Bush, Rubio, and Walker in Three Key Swing States

The former secretary of state has lost ground since April.

Hillary Clinton, former U.S. secretary of state and 2016 Democratic presidential candidate, waves to supporters as she arrives for a campaign event in Cedar Rapids, Iowa, U.S., on Friday, July 17, 2015.

Photographer: Daniel Acker/Bloomberg

Hillary Clinton may have a tough race on her hands. 

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