"It's a horrible prospect to ask yourself, 'What if? What if?' But if certain things happen between now and the election, particularly with respect to terrorism, that will automatically give the Republicans an advantage again, no matter how badly they have mishandled it, no matter how much more dangerous they have made the world," Clinton told supporters in Concord.
"So I think I'm the best of the Democrats to deal with that," she added.
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Marc Ambinder is a contributing editor at The Atlantic. He is also a senior contributor at Defense One, a contributing editor at GQ, and a regular contributor at The Week.