Are they that devastated by Donald Trump’s return to the White House? Democrats are hoping history and voter backlash on the GOP agenda will buoy them to electoral success next year. There are many problems, not least being that they have no message, no agenda, and no charismatic leaders to rally around. They’re a mess—I don’t know how many polls they disregard, but even liberal pollsters know the Democratic Party’s approval rating is trash. The Wall Street Journal found it to be the worst in 35 years, and before they get to a mountain of issues to mount a comeback,...