Mitt Romney will NEVER release any additional tax returns. He'd rather lose, and he wants desperately to be President. I don't know what is in there, and won't speculate here, but it must be something terrible.
The main point though is that if he wins, it will set the new standard for disclosure of tax information by candidates. Never again will we, the people, get more than a token release of tax information. This standard will trickle down throught the political system. We will have lost yet another check on our wannabe leaders.
So if you, or your spouse, or Uncle Johnny or Aunt Tilly vote for Romney, you will be voting for this new standard. I hope you will mention this to any fence sitters still out there.