Fielding candidates in unfavorable districts might seem like a waste of precious resources to a party—and most of the time, it is—but it's also a responsibility.
Having a decent number of staffers available gives state legislators a better ability to make competent, independent decisions and to resist the influence of other actors.
Is there something to the idea that a politician who no longer faces re-election is free to pursue new policy solutions without needing to kowtow to special interests?
Despite the usual array of punditry, there's not much President Obama could have done in the weeks leading up to the recent mid-terms to change the outcome.