As Hillary Clinton's health moves from the fringes to the center of the 2016 presidential campaign, there's a lot we still don't know about her scare this weekend.
Here's what we do know: Clinton was diagnosed with pneumonia on Friday. During a Sept. 11 memorial event on Sunday at Ground Zero, she was unsteady and clearly needed help getting into a van after becoming "overheated and dehydrated." And Clinton canceled a planned to trip to California for Monday while she rests at home.
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