If Romney thought voters wouldn't care about his returns, he wouldn't be going to such great lengths to avoid releasing them. And when Brian Williams pressed him on the topic, that's basically what he admitted:
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As long as Romney hides his returns, there’s really no way to stop the speculation about what might be in them. But if he releases them, then there will be nothing to speculate about: just the facts of what’s actually in the returns. And if he thinks that would be politically damaging, it says something about his returns—not the Democratic Party.