How?

Excerpts from Slate - 

How Trump Happened

It’s not just anger over jobs and immigration. White voters hope Trump will restore the racial hierarchy upended by Barack Obama.

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All of which is to say that we’ve been missing the most important catalyst in Trump’s rise. What caused this fire to burn out of control? The answer, I think, is Barack Obama.

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For millions of white Americans who weren’t attuned to growing diversity and cosmopolitanism, however, Obama was a shock, a figure who appeared out of nowhere to dominate the country’s political life. And with talk of an “emerging Democratic majority,” he presaged a time when their votes—which had elected George W. Bush, George H.W. Bush, and Ronald Reagan—would no longer matter. More than simply “change,” Obama’s election felt like an inversion. When coupled with the broad decline in incomes and living standards caused by the Great Recession, it seemed to signal the end of a hierarchy that had always placed white Americans at the top, delivering status even when it couldn’t give material benefits.

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You can draw a direct line to the rise of Trump from the racial hysteria of talk radio.

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http://www.slate.com/articles/news_and_politics/cover_story/2016/03/how_donald_trump_happened_racism_against_barack_obama.html