What hush period? There is nothing under McCain Feingold that I'm aware of that prevents campaigns from running commercials and taking out ads, or that prevents the administration from speaking at the bully-pulpit.
Remember, on September 3 the FEDERAL GOVERNMENT hands Bush a $75 million check to run his campaign on. Exactly what is that check used for if not political ads and campaign events? Also McCain Feinglod can not stop the White House from issuing statements, granting interviews... Besides, it will smack of desperation just as the DWI "revelation" did last time in the 11th hour.