From the horse's mouth:

SEN. McCAIN: No. No. I--the fact is that I'm different but the fact is that I have agreed with President Bush far more than I have disagreed. And on the transcendent issues, the most important issues of our day, I've been totally in agreement and support of President Bush....I strongly disagree with any assertion that I've been more at odds with the president of the United States than I have been in agreement with him.

Who pray tell is asserting that?? In fact, almost 2 out of 3 Americans believe McCain's policies will be very similar to those GW has put forth.