WASHINGTON - Republican presidential hopeful John McCain on Thursday backed a scaled-down proposal that imposes strict rules to end illegal immigration but doesn't include a path to citizenship. The move away from a comprehensive measure is an about-face for the Arizona senator, who had been a leading GOP champion of a bill that included a guest worker program and would have legalized many of the estimated 12 million illegal immigrants living in the U.S. It failed earlier this year. "We can still show the American people that we are serious about securing our nation's border," McCain said in a statement,...