John McCain -- a 23-year veteran of the United States Navy, 25-year veteran of the United States Congress (21 as senator) -- is running for a second time to be the president of the United States. "I'm not the youngest candidate," said McCain, 71, in a speech. "But I am the most experienced. I know how the military works ... I know how Congress works ... I know how the world works."
(Photo: AP Photo/J. Scott Applewhite)
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