How do you know that? Were you there? According to CNN, he endorsed and supported McCain and spoke very highly of Palin: http://politicalticker.blogs.cnn.com/2008/09/18/trump-endorses-mccain/ IIRC, Trump is also a birther and directly challenged Obama to release his college and law school transcripts.
I saw other FReepers saying it, seems FReepers know everything, just going with the flow. :p