Do the Democrats WANT to lose?

There are people who will stick to a principle, even if it means they never succeed. Like certain football teams, whose coaches believe in the 3 yard out pass, even on 3rd and 17. To a certain extent, I get it. I mean, as a religious believer, I believe there are certain principles that should be adhered to, even if it costs you (honesty, for one). But what the Dems are doing now is puzzling. What principle are they adhering to when they accuse those who disagree with them of being stupid or unethical? Harry Reid gets a lot of Mormon press for supposedly being an example of a good Mormon who is also a Democrat. Listening to his talking points, sounds a lot more like he is a good Democrat who is also a Mormon.

Shouldn't the fact that Democrats have to campaign as Republicans in order to get elected give them a clue? Well, why don't they try actually acting and believing that way, instead of only campaigning that way?