Comparing Trump now with video clips from a decade ago is chilling. The slippage in his verbal acuity is marked. His rages and explosions of temper aren’t part of an act; they’re no longer controlled or controllable. The nearest contemporary parallel was the second-term decline of Ronald Reagan. Americans sensed the terrible gravity of Alzheimer’s pulling at him, but he was still surrounded by largely competent people and was, on the whole, a healthy man. For all the disagreements Democrats had with him, Reagan could never be considered an impulsive narcissist with a hair-trigger temper and no
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