We have already used EMP style attacks in Iraq during Shock & Awe. It wasn't so much as a bomb but instead done via air craft that can shut down all communication & electronics for a limited range for a short amount of time. Including the entire power grid.
It's not science fiction but the likelihood of anyone attacking us with it is pretty much nill. We have probably the most advanced military in the world and we have very limited ability to do such attacks. Even still if we were attack it wouldn't be the entire country but maybe a small part of a city at best.
The only way something like this could have an effect on the whole country is if it were some Natural phenomenon, like some pulse from space or alien invaders. This is just more of the typical right wing scare tactics. Pretty soon they will be trying to convince everyone of a zombie out break from bird flu.
This is why I can't stand Gingrich, because he's of the same neo con ideology, that was Reagan, and both Bush admins. They use scare tactics and bull shit to push their agenda which typically revolves around giving big military contractors lots of tax payer money.
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