On yesterday's Lou Dobbs show, Casey Wian said this about the Ramos and Compean commutation:

Mexico's Deputy Secretary of Foreign Relations Carlos Rico (ph) said, quote, "this is a message of impunity, it's difficult to understand." He also acknowledged that Mexican officials had lobbied hard to prevent the former Border Patrol agent's release.

UPDATE: There's much more on this in the 1/22 transcript. Various congressmen think there was extensive involvement by the Mexican government in the case; hopefully an investigation into contacts between that government and the Bush administration will be launched.