WASHINGTON, Sept. 12 (UPI) -- Potential 2012 Republican presidential candidates seem to be playing a game of chicken, with contenders waiting for someone to move first, observers said. Some 2012 GOP hopefuls this year seem more reticent about promoting themselves before the midterms in November while others are keeping mum for more strategic reasons, Politico reported Sunday. GOP 2008 presidential hopeful Mitt Romney, 2008 vice presidential candidate Sarah Palin, former Republican National Committee chief and current Mississippi Gov. Haley Barbour, and Indiana Gov. Mitch Daniels are among those who are jockeying behind the scenes, leaving Minnesota Gov. Tim Pawlenty virtually...