Don't Question The Messiah
Apparently, if you ask Obama a tough question, this is what happens to you. Maybe that's why the press has given him a pass for the last 20 months.
It doesn't matter that Joe isn't a licensed plumber or that he has tax liens. The point was Obama's answer, which was "spread the wealth." He can make up the 95% number and back into it anyway he wants, but his response to Joe's question plainly describes his approach to taxes: take money from people who have it and give it to those who don't.
UPDATE: Betsy's Page explains this in far more detail than I.