Maybe so. But would you like to make a bet? When GWB does as you suggest (announce a foreign policy speech to be given from the Oval office), it will either be:
1. uncovered by the broadcast networks on the grounds that this is a campaign speech when given this close to the election; or
2. the broadcast media would cover the speech, but then turn around and offer free time to Kerry to provide 'balance'; or
3. any broadcast network that doesn't do either 1 or 2 gets sued through the FCC for providing an 'unpaid campaign ad'.