From a review of Land of the Dead:
Then again, maybe you’re one of those people who are incapable of running. In director George Romero’s parallel universe, “walkers” are the living dead, the zombies who are slowly invading Pittsburgh. They’ve been doing it since 1968, biting and converting one victim at a time. As the zombies have become increasingly resourceful in tracking human prey, they’ve also been increasingly potent symbols of the conformity and consumerism that Romero sees as sucking the life out of America.
The fourth installment in the series (not counting the recent remake of “Dawn of the Dead”) is his most unmistakably symbolic movie yet, a savage indictment of the bunker mentality that has zombified the United States in the age of terror.
In the Nixon years, it was conformity and consumerism. In the George W. Bush years, it’s the bunker mentality. Undoubtedly, for most of the Clinton years, they represented the restrictive legislators and their government protection limitation. One wonders what the zombies represented between 1992 and 1994. Probably the undead menace of “Republican Democracy” that could erupt at any time and did.
UPDATE: In a later review by the same “critic,” War of the Worlds becomes a symbol of Republicans run amok, too.