May 8, 2008 - Just in case you needed any more proof that American Idol auditions are the gateway to the American prison system, we give you Colin Leahy. At the age of 19, he tried out for American Idol. He didn't make it, and now spends his time volunteering at a Brooklyn elementary school. Leahy, now 23, was arrested Wednesday for sending sexually provocative text messages to a 12-year-old male student and…