I do agree with that assessment, and I probably said as much a few times here on FreeRepublic at the time. Not only that, but some of those candidates would have been a complete disaster (Gingrich, for example). I like your analogy of the three-legged stool, too.
Someone on TV tonight, I think it was Krauthammer, said he thought Romney should have picked Gingrich as his running mate to balance the ticket—a Mormon and a polygamist.
I wish I could claim the 3 legged stool analogy, but I didn’t make it up. It cam from Reagan actually.