Do Democrats also promote Candidates that will work against voter's interests?

Never mind Pelosi. Now exactly when does the DNC think that incumbency actually begins? Because old Joe Crowley certainly didn’t think it began after he lost the primary because he saw fit to run against Cortez in the main election anyway. I guess that was just the supportive thing to do for a valued incumbent. Or was Joe out of the club at that point? If he managed to win you would have spurned him, not let him back in?

Incumbency is a weak test for who the party ought to support. Party officials in the Bronx knew what was going on there, or rather what was not going on, and should have asked Joe to shuffle off long ago. When incumbency starts forming insiders clubs that don’t work for their constituents, its time to change the way you regard them.