Can anyone run an AdWords campaign? Absolutely. Can anyone create a campaign, create some ads, and work on the CTR? Probably. But not everyone can manage a $20,000/month campaign. You need someone that can immerse themselves into the campaign and really understand what the numbers mean.
You need someone that can get inside the customers head and create ads that work. That's the big difference between a successful AdWords (and Yahoo, MSN) professional and a person that 'babysits' the campaign.