The text "turning Jobs down on making campaign" isn't in the article. It says "he’d become annoyed when Obama’s strategist David Axelrod wasn’t totally deferential" which makes it sound more like Jobs' issues were the barrier to cooperation.
You don't have to use what he makes, but if you want genius, and why else would you want Jobs and his team to design an ad, you ask politely and then get out of the way.
Edit: Somewhere online I read an article about Jobs getting Paul Rand (edited from Milton Glaser) to design the logo for NEXT. Can't find with a quick Google search, but it was a fascinating read.
Edit: the video has the quote I was thinking of, but what I read was an article. From the video (Jobs talking):
> I asked him if he would come up with a few options. And he said, ‘No, I will solve your problem for you, and you will pay me. And you don’t have to use the solution — if you want options, go talk to other people. But I’ll solve your problem for you the best way I know how, and you use it or not, that’s up to you — you’re the client — but you pay me.’
FYI: Jobs had Paul Rand do the NeXT logo.