More dumb polling

So, in the WaPo's latest poll of low-income workers, I was surprised to read this fact:

Nearly six in 10 white and black workers said they think undocumented workers take jobs away from those here legally; seven in 10 Hispanics disagreed. (Nearly half of the Hispanic workers interviewed in this poll are not U.S. citizens.)

Note to the WaPo: non-citizens can't vote.