DUBAI DUETS Late Friday, Department of Justice lawyers in the Office of Legal Counsel were attempting to determine if former President Bill Clinton had registered as an "Agent of a Foreign Principal." Federal statute requires that anyone -- even a former President -- doing political or public affairs work on behalf of a foreign country, agency or official must register with the Department, and essentially update his status every six months. It was not clear the Clinton had done so. If his status is less clear, here is what we do know: If Senator Hillary Rodham Clinton did not know...