Weld to be Mexico ambassador

WASHINGTON Massachusetts Gov. William F. Weld said Saturday thathe has been offered the job as U.S. ambassador to Mexico and willtake it.

Weld said he was told Saturday by National Security AdviserSandy Berger that he would be nominated for the job.

The post would preclude him from participating in politics forat least the next few years, including the 2000 presidential race, hesaid."I don't think you can be an …