Mitt is ending this race now imho, if he does not release his tax returns so he can get on to other issues.
MANY Republican operatives like george will, bloomberg magazine, national review.... have said such themselves....
I say if he hasn't broken any laws, he should just release them back to 2000.....if he has broken laws, then he does have the right not to testify against himself, (or not release information that could get him legally in trouble, the 5th) and he probably shouldn't release them.
We already know he is rich, we already know he pays a lesser income tax rate than most in the mid to upper middle class, and less than other wealthy people like Newt Gingrich and Obama....we already know about his offshore tax haven investments through his 2010 returns....so if his previous tax returns only show the same ole same ole, then mitt should have no problems releasing them....in my opinion.
BUT if there is something else that he doesn't want us to know, like taking amnesty in 2009, or how he got soooooo much money in his IRA when there are legal limits on what can be put in them each year, or that he lied about Bain Capital and when he left.....
Then by all means, he should keep hiding them....