MEXICO CITY -- President Vicente Fox has rehired the Texas public relations man and GOP political consultant who quietly helped engineer his election victory in 2000. This time, Fox wants Rob Allyn & Co. to put the brakes on growing anti-immigration, anti-Mexican sentiment in the United States. -- snip -- After the July election, Allyn told the Dallas Morning News he hid his work for Fox because he didn't want to be a political liability. Mexicans are sensitive to foreign interference, especially involving the United States. -- snip --