Running for president, even six months before the general election, can seem like a marathon.
Democratic rivals New York Sen. Hillary Clinton and Illinois Sen. Barack Obama routinely put in 12-, 16- and even 20-hour days, with each hour carefully scheduled.
David Greene followed Clinton on one such day, when she traveled from North Carolina to Indiana to prepare for the May 6 primaries in those two states.
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/ Lindsay Mangum, NPR
