Mr. McCain should be required to see “Wall-E” to learn just how far adrift he is from an America whose economic fears cannot be remedied by his flip-flop embrace of the Bush tax cuts (for the wealthy) and his sham gas-tax holiday (for everyone else). Mr. Obama should see it to be reminded of just how bold his vision of change had been before he settled into a front-runner’s complacency. Americans should see it to appreciate just how much things are out of joint on an Independence Day when a cartoon robot evokes America’s patriotic ideals with more conviction than either of the men who would be president.