The only notable elections this year are for governor in New Jersey and Virginia and for mayor in New York. The Democrats’ next chance to win back some power nationally will come at the mid-term elections in November 2026. If the party retakes the House of Representatives or (a longer shot) the Senate, it will be in a better position to curb Donald Trump’s excesses. It will have a say on the federal budget and power to investigate wrongdoing in high places. But given the party’s disarray, will it make much headway? Voters usually treat mid-term elections as a referendum...