The stark contrast between Bush’s inability to speak with skill or credibility and Palin’s exceptional ability to deliver her speech should clearly demonstrate that the speaker – not the speechwriter – is the person who makes the real difference.
Scully is one hell of a speechwriter – presumably, that is how he got the job of writing for the President of the United States. His talent as a writer is also how he got the gig writing Palin’s speech. It might be fun to fantasize that Scully is some sort of Republican puppet master able to possess politicians to do his evil bidding, but it just isn’t so. There should be no reason why Scully couldn’t or shouldn’t be asked by anyone to serve as a speechwriter regardless of whom he has written for in the past.
Speechwriting is a lot like PR in that
A speech is only as strong as the person delivering it