One thing nobody mentions is when pollsters call cell phones, they may well be ignored, unfamiliar numbers that might be collections dunners (medical debts, CC debts, all sorts of nasties) that private sector people economically damaged by zero are not going to pick up.
People with Gov jobs who have survived the great recession quite unscathed and financially healthy, thank us, are more likely to pick up an unrecognized number and be polled.