On his first big campaign swing since locking up the nomination, Trump went after an odd and seemingly random group of people — Democrat and Republican, famous and obscure. There seemed little to gain politically from the attacks and his targets were linked together by just one thing: Trump felt they had all done him wrong.

So he blasted Republicans who have yet to endorse him, including Jeb Bush, New Mexico Gov. Susana Martinez and Mitt Romney, who Trump said “walks like a penguin.” He declared that Democratic front-runner Hillary Clinton doesn’t look presidential and went after her allies, especially Sen. Elizabeth Warren (D-Mass.), whom Trump continues to call “Pocahantas” even after being told the nickname is offensive. He mocked those protesting him and slammed reporters covering his candidacy.

During the four-day, four-state tour, Trump also went after people who were likely unknown to his supporters until he brought them up: Barbara Res, a former employee quoted in an article about his treatment of women, and federal Judge Gonzalo Curiel, who is assigned to hear a fraud case against now-defunct Trump University…

But with the primary now over, last week’s fusillade of digs seemed counterproductive. Why go after the GOP’s only two female minority governors– Martinez and South Carolina Gov. Nikki Haley — when there are so many other elected Republicans who have not endorsed him? What does he gain from smearing a former employee and a federal judge that most of his supporters have never heard of? Why comment on Clinton’s voice and appearance instead of her record?