Is that because of falling real income or rising taxes?
A lot of those rising taxes are to pay for the government social programs for a population that is unable to work and provide much of a living for itself. In this area you can find many "NAFTA displaced workers" --- thousands of them who will never work again --- many are only in their 40's and 50's and they're living off the many government programs which taxes must support.
I could see the free trade argument that we don't need low skilled laborers if we weren't importing so many at higher rates than ever --- and also if we would encourage those we have to leave the country to follow their jobs out.