Dave DaviesDave Davies is a guest host for NPR's Fresh Air with Terry Gross.
Author Michael Wallis says there are modern lessons to learn from the Donner Party — primarily about the fatal combination of ignorance and arrogance. Above, an undated drawing of the pioneers, looking to make their way West.
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A polling station in Oakmont, Pa., on Nov. 6, 2012. Winning a presidential nomination includes mastering complex rules about delegates, and Pennsylvania's rules are among the most complicated.
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