Why Donald Trump is so politically dangerous

One candidate for president of the United States has devoted decades of her life to the goal -- a never-ending 30-years-long campaign for power and respect. Another adheres so strongly to a set of beliefs that he calls himself a socialist long after it's lost its cool. Another fashions himself as a redeemer of a lifetime's worth of conservative grievances, risking social isolation and the faith and credit of the United States to make a point. And then there's Donald Trump, who more or less has n...