Not yet, but it's getting there. I think by Thanksgiving, he'll need to make his move in the polls. That being said, I think the nomination is still his if he wants it. He's got the $$$ and the machine behind him. Sometimes if you're in the media's eyes too long, you go stale. Perhaps this is a calculated strategy?
He just blew a huge portion of money on his latest ad campaign in Iowa and New Hampshire, and the money is starting to dry up plus he has been falling in the polls for the last couple of months. If this is part of his strategy, it's clearly failing.