Lawrence O'Donnell has figured out the real reason why Romney won't release his tax returns. If he does he's politically dead as a doornail!
Check out this video: http://video.msnbc.msn.com/the-last-word/48684212#48684212
If this becomes more widely known before the Republican convention it would not surprise me if they (i.e. Republicans) found a way to dis-nominate Romney at their convention.