i don't think so, a clear military attack on American soil by a foreign nation would mean lines around the block at local military recruitment offices in every city/town across the nation. Congress would have a full declaration of war signed in an hour.

Terrorist attacks like 9/11 leave doubt about who to go after and at what scale to retaliate but a clear attack on a city by a foreign state as an act of war is a different thing. Gloves would come off and the complete full force of every resource ( military, political, economic, etc ) would be brought to bear.

That's just a thin veneer. Do you think that if the US were attacked somehow, we wouldn't have a repeat of 2003?

No, I don't think so, not exactly.

It depends on the specifics, of course. If a specific country directly attacked the US, of course I'd expect (and even demand) a military response. But these days, I wouldn't expect a non-state's terrorist attack to lead to the sort of misguided, ill-informed adventurism that ultimately led us to invade Iraq.

You can't get elected to a minor office in the US without saluting the flag and supporting the troops.