AMC just sent Rubicon a four-leaf clover: The critically lauded-but-low-rated conspiracy thriller will not be renewed for a second season, the network announced Thursday.James Badge Dale), who discovers a pattern in several large newspapers. After some digging, he learns that his employer is part of a group that uses intelligence to manipulate world events for profit.The cancellation is not completely unexpected: The show averaged a meager 1.26 million viewers over its 13-episode run. Season 1 ended with Will confronting his boss/nemesis, even though he didn't have enough hard proof to take him down. Henry Bromell told TVGuide.com of the open-ended finale. "It's not interesting drama. It's a little more conventional, a little easier. ... The truth is, that it's not that easy to stop the bad guys."Rubicon was AMC's third original series following the Emmy-winning successes of Mad Men and Breaking Bad, which have been renewed for fifth and fourth seasons, respectively.On Halloween, AMC launched The Walking Dead, an apocalyptic zombie drama based on Robert Kirkman's beloved comic book series. The premiere drew 5.3 million viewers, the network's largest audience ever for an original program. AMC has since ordered a 13-episode second season.Are you sad that Rubicon won't be back?