The Republican media expert that put George W. in the White House and is winning the nomination for McCain, will leave McCain's campaign team if Obama wins the nomination: "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."
Bad, presumably, because you'd have someone supporting the other side running your campaign.