"Wonder how long we're going to tolerate this ?"
I'm afraid for a long time. At least until Bush is out of office. He no longer has any political capital to open another front in the war. Congress would de-fund it quickly screaming about another "illegal war".
The Iranians will not be blamed for the American deaths in Iraq, even though the IED's were made in Iran. As I said before, Bush will be blamed for "making the Iranians" supply bombs to the "freedom fighters".
Bush doesn't need Congress to bomb the hell out of Iran.
Luckily, I doubt President Bush will sit by and wait for us to be blown to smithereens because he's worried about people criticizing him.