Middle class is defined as those making $60-$100 thousand a year. 60% of American citizens make under that now. 
Conservatives can bend it, twist it and warp it as you usually do and call someone making $20 thousand middle class to suite the warped agenda to rid the country of the middle class. A successful agenda so far. This will benefit the weathy millionaires and billionaires where the conservative agenda lies. But it will hurt this nation as a whole.

President Obama: The people of the world can live together in peace. We know that is God's vision. Now, that must be our work here on Earth.