Immigration reform was once Sen. John McCain's signature issue – and a key ingredient in his maverick image. Democrats have largely avoided the subject, but there are signs they'll be using the issue this fall to challenge the Republican presidential nominee's maverick claim. "Everybody's so scared to touch the subject, because in certain areas it's detrimental to somebody's political future," said Rep. Charlie Gonzalez, D-San Antonio. "It's an issue that legitimately should be addressed." Hispanics are the fastest-growing segment of the electorate, and analysts predict turnout as high as 9 million, up from the 2004 record of 7.6 million. Their...