Democrats continued their 2017 run of being unable to win special elections in strongly Republican districts on Tuesday. These results have led people to ask what the Democratic Party must change if it is to take back Congress (and eventually the White House).

I have what may be the most cynical answer, but one that is unavoidable: What the Democrats need is better marketing. That’s really about it.

Just to be clear, I’m not saying that as a general principle Democrats should stop worrying about policy…