During a hot, brittle August, President Obama will spend three days this week on a bus campaigning across Iowa.That devotion of presidential time to the Hawkeye State during the general election is considered extraordinary, showcasing the importance the incumbent places on defending the battleground states he won four years ago.The Iowa caucuses first put Obama on the path to the Oval Office in 2008, but since then much has happened in the world to leave Iowans torn between the incumbent they know, and the challenger they weren’t entirely sure they favored this past winter.Mitt...

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