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Thanks
He introduced 2 new symbols today.
First, he emphasized that he is "honored." That introduces humility into the equation.
Second, Trump said several times that certain things were not appropriate (like Priebus staying for the presser...giving the impression of an endorsement). By this word he is raising the banner of proper behaviour.
Both of these newly introduced elements are evidence of his becoming more presidential.
Trump does everything according to strategy.
This is a major shift IMHO.