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Mr. Trump goes to Washington

Mr. Trump goes to Washington

The visit Monday wasn't quite like Jimmy Stewart's in the famed movie. But Donald Trump's day in D.C. revealed a version of the man different from the bragging, profane hotel tycoon who has become the frontrunner for the Republican presidential nomination.

Temporarily laying aside his red "Make American Great Again" campaign cap and sporting a sedate tie and dark business suit, Mr. Trump visited the Washington Post editorial board, his new luxury hotel conversion at the Old Post Office Building and then the AIPAC conference at the massive Verizon Center, which houses the Washington Wizards pro basketball team.

At each venue, he figuratively stepped out of phone booth...