From this highly recommended article:

While Mexican politicians continue to press the United States to improve the lives of illegal immigrants north of the border, they are failing to make urgently needed reforms that could help their countrymen stay home, political analysts said this week.

"Mexico has been totally incapable of resolving its own problems and is finding a convenient scapegoat in the United States," said Luis Rubio, president of the Center of Research for Development, a Mexico City public-policy think tank...

George Grayson, a Mexico expert at the College of William & Mary, echoed the criticism. He said Fox is performing a familiar Mexican political maneuver: demanding that the United States be a migratory safety valve to relieve political and economic pressure at home.

"Fox's domestic agenda is paralyzed, so he's hoping the skies will open and there will be sunshine beaming from the United States in the form of an immigration accord," said Grayson.

See also our great State Department at work in "Powell urges Fox to be patient on U.S. immigration action." Perhaps Powell should read the other article.