Technically this war (World War IV for those keeping count) is like the last one, WWIII (the Cold War). While the Soviet Union backed covert and direct influence in America, Cuba, Vietnam, and elsewhere some nations offer state sponsorship to terrorism.
Some skirmishes were fought publicly, some battles (or near battles) we are only hearing about now (20+ years later) and some we may never hear about.
There also exists a fifth column in America like existed during the Cold War. Some "Americans" have chosen up with "the other side". Handing over nuclear secrets is the least of the actions we have to fear from these new fifth columnists.
Also, the Cold War left us with communist party faithful who still revere the old Soviet Union. I'm talking about persons in America and it is no surprise that these party faithful were among the first to mount "antiwar" (and pro-Stalin) protests.
These radical leftists have little actual chance of overthrowing the American constitutional government but it remains their longterm goal. Perhaps they side with radical Islamists in spirit because "the enemy of my enemy is my friend".
Preaching seditious overthrow of the American government and even of the newly formed Iraqi government are not protected speech. The nations that oppose terrorism (Islamofascism in specific) already have the legal ability to silence those stoking the flames of hate.
England knows that such seditious materials are being screened on video at mosques yet they are (too) slow to shut down such activities. More attention needs to be focused on how long such "cover" organizations were permitted to operate in America in the 1990s in this 9/11 commission.
Maybe when the "will" is there to fight this war with genuine determination, it will be won. Otherwise we will just be winning the battles but losing the war.
We won the battle against the Soviet Union with regards to the Cold War but seditious socialism remains in America and some are no longer afraid to declare their communism and defense of Joseph Stalin.