Was Mitt Romney ever a 47 percenter?

What was Mitt Romney's 2009 tax rate? With Mitt Romney defending his attack on 47 percenters, it seems like as good a time as any to mention that we still haven't seen Mitt Romney's 2009 tax return. After all, of the 400 wealthiest American taxpayers in 2009, six paid no income tax whatsoever. And in 2011, about 7,000 taxpayers with income over $1 million paid no income taxes. So despite his claims otherwise, there's a non-zero chance that Mitt Romney's federal income tax in 2009 was in fact zero. If that were in fact the case, wouldn't it be quite the irony? Odds are, we'll never know. But I sure am curious.