That's what Ambers and others have reported. Steve Schmidt was not so clear:
All Schmidt would say is Palin and McCain had discussed the pregnancy and considered it to be a private matter. He wouldn't say if they talked about it before McCain picked Palin as his vice presidential nominee. "I answered that question nine times," he said.
They're flying blind.
This article available online at:
http://www.theatlantic.com/daily-dish/archive/2008/09/mccain-knew/212187/
