SACRAMENTO — Although Gov. Arnold Schwarzenegger has flung himself into the roiling debate over illegal immigration in recent weeks, he had virtually ignored the issue since being elected. He made immigration a campaign theme in 2003 by promising to block driver's licenses for illegal immigrants — which he did, in his first major official act — and to secure more federal funds to deal with it. But a review of Schwarzenegger's public speeches and statements shows he has been silent, with a few exceptions, on an issue that has raised alarm across the political spectrum. Lawmakers and immigrant groups say...