He is wrong in this. I am part of the 47% that because of lots of kids and various other reasons end up getting a fairly large welfare check every year (called a tax return). I do work full-time and make about 40,000 a year, but I don't have a net pay in on income taxes. Now considering all the consumption taxes and fees I may still be an overall net payer into the system, but not by much.
Mitt is wrong in this, I will be voting for him, and I know a number of working class people who are also do not pay into the federal system who will also be voting for him.
I realize that to get our system in order my benefits may be cut, but I am okay with that because I believe in the long run it will mean more jobs, higher wages, and less fees.