General Discussion
In reply to the discussion: Every UNCONDITIONAL supporter of the Democratic Party, step forward! [View all]KPN
(17,411 posts)of voting/voters today. Many voters are looking for "authenticity", genuine people, straight-forward talk as opposed to just shared positions on issues these days. Seems to me that has to be factored into which candidate might stand the best chance as well (which seems to be the standard in your "unconditional" construct). My two cents anyway.
As for answering your question, it won't be an issue for me as there aren't any challengers to the two Democrats who will be on the federal ballot in my State/District in 2018.
But my answer otherwise would be more along the lines, I'm okay with incumbents being primaried. If I lived in a red State, which I don't, I'm sure electability would be a strong criteria for me, but I might also define "electability" a bit differently than you depending on circumstances (the voters) in that particular State/District.