Cohen: Why Trump's presidency is already finished

VINALHAVEN, Maine – Donald Trump has been president of the United States for just over six months. Usually, at this stage of a presidency, the talk is still about the beginning: hopes, ambitions, progress.
With Trump, after six months, the talk is about the end: frustration, defeat, paralysis. In coastal Maine – a state that gave one of its electoral votes to Trump in 2016 – the questions have the same urgency this summer as they do in Washington.
Will Trump last four years? Wi