Donald Trump won the presidency by the seat of his pants in 2016. Republicans have lost the House, the White House, the Senate, and governor's mansions in the years since. He has been impeached twice. In the past month he has been indicted by a Manhattan grand jury and found liable, in a separate civil suit, for sexual assault and defamation. He remains in legal jeopardy, with prosecutors in Washington, D.C., and Atlanta, Georgia, mulling charges in cases related to the 2020 election and to his transfer of classified documents to his Florida home. He has the highest unfavorable rating of any...