Brien Tillett runs in a park in North Las Vegas on July 12, 2016. A cross country standout, he plans to run on the team when he enrolls in community college in northern California in August. Millennials have edged out baby boomers as the largest living generation in U.S. history, and more than 75 million have come of age. With less than three months to Election Day, the values of young Americans are an unpredictable grab bag. (AP Photo/John Locher)
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