The beauty of this story is that the primary participant is no longer available to provide any information. The person who evidently provided much of the info wasn't present when the alleged incident occurred. How convenient.
As far as Romney not remembering the alleged incident, skeptics are invited to read a book called The Invisible Gorilla (or something like that. Look it up.). It's a tough read as it is more scholarly than Reader's Digest but it provides ample evidence regarding the fallibility of human memory. Remember Hillary's landing under fire in Bosnia. Prior to reading the book, I believed Hillary to be knowingly lying. After reading the book I'm not sure.
Anyway, the WP story is a perfect hit piece. There's no there there.