Florida man arrested in Walmart shooting threat called himself white nationalist in Facebook post, cops say   FBI agents waited more than an hour at the Winter Park home of Richard Dean Clayton’s parents before the 26-year-old entered unannounced through the back door.   The agents said Clayton, who had threatened to shoot up a Walmart, was “manic” — erratic, paranoid and profane.   He went from apologizing to his parents in tears to accusing them of setting him up:
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