A bit old, but Peter Beinart, writing the TRB column for The New Republic(registration required), argues that the Democrats ought to be the party of no ideas this fall. (No, that's not a typo.) He thinks that the voters will express their dissatisfaction with the GOP at the polls as long as the Democrats don't say what they'd do differently. From their, Beinart suggests, it'd be all downhill.
At least he's honest.