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1) these are the shiny things that distract Lefty while the president is getting things done,
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Yeppers, Trump spending half an hour on Twitter gets his political and MSM all wound up and occupied for the rest of the day while he gets down to the country's business.
On another somewhat related point, if he hadn't seen it before or to the same degree, Trump probably saw the power Bush got from being severely underestimated. Trump seems to be making fuller, non-abusive, use of that power.
IOW Trump has gone beyond not interrupting his opponents when they are making mistakes into encouraging those mistakes.