They have fair points to make, as they would in many such countries: poor ethnic minorities are not peculiar to Mexico.

ECONOMIST: Mexico��s southern sore

Those facing social disadvantage, including the poor, migrants and ethnic minorities, are particularly affected.

UNESCO: MEDIA SERVICES

These attitudes span all ages, ethnic groups and economic groups, but non-voters are particularly prevalent among the young, poor and minorities, studies show.

CNN: NHPrimary.com: Non-voters will stay in the shadows

Typically, it is the poor, remote rural populations, those affected by conflict, or those belonging to ethnic, racial and linguistic minorities that are most often left out of education.

UNESCO: HIV and AIDS