When Cardinal Roger Mahony called on Roman Catholics this week to embrace immigrants regardless of legal status, he wasn't just reiterating the church's long tradition of reaching out to the downtrodden. Mahony and other U.S. Catholic bishops are increasingly weighing into the debate over what to do about the roughly 11 million illegal immigrants living in the United States - a development that's being met with criticism from groups pushing for tougher immigration law enforcement. Catholic leaders have launched a "Justice for Immigrants" campaign, appealed to President Bush and congressional leaders for a legalization program, and sharply criticized a bill...