PHOENIX — Struggling to pacify his party's warring wings, President Bush is moving toward allowing illegal immigrants who came to the U.S. before February 2004 to qualify for guest-worker visas. People smuggled in after then would be deported. State leaders in Arizona and New Mexico have stepped up pressure on the Bush administration and the Republican-led Congress to better police U.S. borders and deal with an estimated 10 million people who are living illegally in this country. "They're trying to split the baby," Sen. John McCain, R-Ariz., said of the White House plan, "and I don't think they can do...