This is an interesting article on the EMP threat:
http://www.americanthinker.com/2006/04/the_emp_threat_electromagnetic.html
From my research the most likely delivery system would be from a freighter...say an Iranian freighter disguised as an African one. They would launch from the Gulf..perhaps near Florida. Then scuttle the ship...so no evidence where it came from. How would giggles respond to that? Do nothing I’m sure. Declare martial law and take our guns “for our safety”.
Just picture it..no power..no refrigeration..no running vehicles..food runs out..no cell phones..no net...no myspace!! The horror! People would turn crazy..a real mad max situation.