One of the best developments for Democratic Party this nomination campaign has been the dramatic decline of "electability" as a factor in the party's nomination process. Comparing the percentage of voters who cited electability as their top concern in 2004 and 2008 makes this clear:
% of Dem Primary Voters Citing "Electability" As Main Candidate Criteria
Across the board, every state that had an exit poll in both 2004 and 2008 shows massive drop off in the focus on electability. Even if identity appears to be the top vote determining factor in 2008, that is still a step up from 2004. Democrats are voting in record numbers for the candidate they want, not just the candidate for whom they will settle because they think s/he has the best chance to win. Further, broadcasting to the entire nation that Democrats don't really like their nominee that much, but they will vote for him anyway because he has the best chance to win, is a terrible way to sell the party and the nominee. It makes it appear that Democrats don't stand for anything except winning. Also, it takes the focus away from the positive qualities of the nominee, and makes him appear to be a lukewarm compromise from the start of the campaign.
Electability died in this primary season. Good. As long we win in November, it should be a long time before the party is dominated by that unproductive concept once again.