There are plenty of rural areas, particularly in the upland South and parts of the Midwest, that are more populist than right-wing. If the Democrats at some point drop the trend towards being a culturally liberal, economically neoliberal party which keeps inner-city minorities with valence issues, and become an economically left-populist party, they would do much better at a congressional level.
Though taking over some of these swingy suburban areas helps us wing, it also bring many moderates and neoliberals on board, which is the last thing I want.
It depends though - will they elect populists who will support most of our economic agenda or Blue Dogs? And I'd much rather New Dems to Blue Dogs.