Byron York points to one big upside of a Romney withdrawal: my email box will be a lot less cluttered. In fact, as York also notices, it already is less cluttered. I haven't gotten a Romney spam in almost 24 hours--which, given his campaign's spam-rate, is actually kind of shocking--and may well mean that the end is nigh for Mitt.
Update: Oops, and now I see that it is.
--Jason Zengerle