I couldn't bare to read all this thread.
They're both politicians at this level because they've changed their opinions based on what they've seen, and also what's popular. I would frankly find it refreshing to see a canidate admit that they would be willing to change their position on several issues if evidence was presented to them that their position would be harmful to the country.
They've both done it so many times, that to argue who does it more will create a stunning list. Moreover, I'd look at what they've changed their positions on. I saw an impressive list on page 2 of some of the many positions that McCain has changed.
Obama has changed his position on public financing.
And McCain has changed his position on torture.
I cannot trust the commitments of a man who's campaign message has largely relied on the overcoming horrors he's had to endure in war, reversing his position on torture.