To the casual observer, it may seem early to be sizing up the 2012 Republican presidential field. But despite the fact that only one hopeful has announced plans to run thus far - that would be former Godfather's Pizza CEO and relative unknown Herman Cain - likely candidates have been working feverishly behind the scenes to lay the groundwork for a credible run at the GOP nomination. They've been lining up staff, speaking to key constituencies in early voting states like Iowa, South Carolina and New Hampshire, raising their profile through media appearances, and building the fundraising networks crucial to...