As rising fuel costs threaten the political hopes of Democrats in the upcoming midterm elections, an ominous chorus of online chatter among domestic extremists in the dark corners of the Internet advocating attacks on critical infrastructure across the nation may pose an even greater threat to U.S. consumers. Newsweek has obtained two documents that offer an insight into the scope of the threat, including reports of several actual attacks that have happened in past few months. The first is a corporate intelligence security memo detailing at least 15 instances over the course of just over a year showing suspected extremists...