N.M. Const. art. VII, § 3

[Religious and racial equality protected; restrictions on amendments.] The right of any citizen of the state to vote, hold office or sit upon juries, shall never be restricted, abridged or impaired on account of religion, race, language or color, or inability to speak, read or write the English or Spanish languages except as may be otherwise provided in this constitution; and the provisions of this section and of Section One of this article shall never be amended except upon a vote of the people of this state in an election at which at least three-fourths of the electors voting in the whole state, and at least two-thirds of those voting in each county of the state, shall vote for such amendment.