President Trump showed the power of his endorsements in Republican runoffs in Alabama and Texas, ending a brief losing streak and demonstrating the strong pull he continues to have among GOP voters, even as his national approval numbers slide.

Mr. Trump effectively ended the decadeslong political career of Jeff Sessions by endorsing his opponent, former football coach Tommy Tuberville, who won the Alabama Senate GOP nomination by more than 20 points on Tuesday night. In Texas, Mr. Trump elevated Dr. Ronny Jackson, a former…

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