Dumbest thing we do is to keep fighting primaries long after they're over.

that phase is over, and support is what we do. We have to trust the voters in every district and state to decide who is the best candidate in November. Once they decide, we should offer our support for that Democrat in November, either with money or time, or at least without dragging that candidate down or interfering with his or her chances.

We need to do that for every race. If you have nothing good to say about some candidate, then say nothing. It's simple.