by Drummond, Fri Feb 15, 2008 at 08:00:25 AM EST
I don't think I've seen anything like this.
Mark MacKinnon, who designs Mr McCain's advertisements, said he could not face being part of a campaign that "would inevitably be attacking" Mr Obama.
"I have met Barack Obama. I have read his book. I like him a great deal. I disagree with him on very fundamental issues but it would be uncomfortable for me and it would be bad for the McCain campaign," he told National Public Radio.