NPR has an article on Sunday's protests titled, "Following Arab world's lead, Mexicans rise up".
This is a poor comparison from the headline writer, for a number of different reasons. 1) Calderón isn't a dictator; 2) No one was asking for Calderón to leave office or the country; 3) Such marches have happened several times in the past without any Arab Spring to motivate them; 4) The spark for the protests --the murder of Javier Sicilia's son-- has no good corollary in the Arab world's recent turmoil; 5) The issue is not political opening, but rather the levels of violence in Mexico.
The article, written by Ioan Grillo, who is about as reliable a reporter on Mexico as there is, is much more circumspect; regarding the comparison inspiring the headline, he has only three short paragraphs (out of 23 total) that include any reference to the Middle East, one of them a quote. This is not the first time an NPR headline has put too fine a point, and in the processed totally mucked up, a more nuanced article.