Rhodes Cook has this lengthy analysis, pointing out that it is not too late for a new Republican presidential candidate to emerge. Cook is well-positioned to write this article. He is the editor of The Rhodes Cook Letter, a quarterly publication that analyzes election returns, polling data, straw polls, for presidential, gubernatorial and congressional races. Also he is the author of America Votes, a massive book of election returns that appears every two years, and which has been coming out since 1956. Thanks to Political Wire for the link.