I am generally bullish about Democrats’ chances of retaking the House majority in 2026. That’s because the history of midterm elections is pretty overwhelming when it comes to seat losses for the president’s party. When a president is unpopular in polls—as Donald Trump is today—those losses are even steeper. And yet, I don’t think a Democratic-controlled House is in the bag just yet. Why? Well, for much of the past year, I have been hearing from smart Democratic strategists who insist that their party has fallen badly behind Republicans in one of the critical nuts and bolts needed for winning...