A zombie idea persists when it's "one of those things that everyone important thinks is true because everyone they know says it's true." A prime example is the oft-repeated citation of the Head Start Impact Study as proof positive that Head Start does not work.
Mitt's "will the United States be an entitlement society or an opportunity society?" is vapid and misleading. Not just a false choice, but an illogical one, like saying "we must decide whether to grow food or eat food."