You're being far too generous to Mittens. He's nowhere near to being 60% conservative. I don't know that I'd even give him a 40% conservative rating, given his record and his past statements.
But Romney is a 100% political opportunist, who will spin whichever way the win blows. He's got no real core values, and is well-known for being all over the map, which is why he's almost uniformly despised on this website.
Just a little reminder that Mitt's been a trickster for a long time now. Here's a thread from January 2008 (the linked article is from 2006!): Is Mitt Romney Conservative? (Gov Romney Supported Abortion & Gay Agenda with Judges & Boy Scouts)
Show me a politician that hasn’t been a “trickster” or hasn’t flip flopped or hasn’t been “true to his core”. One hasn’t lived, because they don’t exist.