Corrupt, activist government that has a tremendous amount of political power inside the U.S. Mexico receives around $20 billion per year that their citizens who are in the U.S. legally or illegally send home, giving them a financial motivation to encourage "migration" by any means necessary. By sending people north, they also get rid of people who might otherwise remain there and push for reform.
Mexico has power inside the U.S. due to politicians willing to push their agenda; president George W Bush even made a pledge to that government and the people of Mexico that he'd push for comprehensive immigration reform. They're also directly linked to a few U.S. non-profit organizations (such as the ACLU) and indirectly linked to dozens more. Also linked to some of the main organizers of 2006's illegal immigration marches, and that government may have used proxies to agitate their citizens to take to our streets in an attempt to change our laws. Many local bureaucrats are willing to collaborate with them as well, such as by allowing them to pass out their Matricula Consular ID cards on public property. Has conducted at least one advertising campaign inside the U.S. in order to push their agenda, with the assistance of the George W Bush-linked Rob Allyn.
One of the ways they agitate inside the U.S. is through the Institute for Mexicans Abroad, an advisory committee to the Mexican government made up of Mexican partisans who live in the U.S. (including U.S. citizens).
The IME's "Directorio de los Miembros del CCIME 2006 - 2009" is at www.ime.gob.mx/ccime/directorios/dir_ccime_06_09.htm
Among many others, it includes: