This is a really strange thing for Mitt Romney to say:
I'll release those on April 15, and the reason is very simple: I want to beat Barack Obama. I don't want to give the Democrats a nice little present of having multiple releases. We're going to have one release.
The reason that's such a strange thing to say is that the only way to make sense of the argument is that Mitt Romney believes releasing his tax returns will be a political problem—otherwise it wouldn't be a "nice little present" to start releasing returns immediately.
So the question is: what is there in his returns that he thinks would be such a nice little present? And why doesn't he think Republican primary voters should know what they're buying before it's too late to return the "gift"?
7:50 AM PT: Via Brainwrap, fun video on this from the DNC: