Well, for what it’s worth NRO thinks it’s true...crap.
http://campaignspot.nationalreview.com/post/?q=NThjZTFmZDI5NzgwMTc2M2M1YzgzMjgzZTczYjY3NjU=
NRO is basing that on the DetNews piece.
Here, watch Google and see how a rumour spreads:
http://www.google.com/search?hl=en&q=%22mccain+pulling+out+of+michigan%22 (251 results as of 3:16PM Eastern)
Everyone will repeat what ONE GUY said, because it fits what they want to hear.
Watch this grow (and then fade away)
Right now, at 3:18PM Eastern, Google has 4 stories in News carrying this: http://news.google.com/news?hl=en&q=%22mccain%20pulling%20out%20of%20michigan%22&um=1&ie=UTF-8&sa=N&tab=wn
This is a GREAT LESSON in managing the media. Watch and learn.