Watch out, Sarah Palin. Newt Gingrich has quietly amassed quite a war chest without filling the tabloid pages. With a surprising $8.1 million haul in just the first half of the year, Gingrich's political action group enables him to take on Mitt Romney and other potential 2012 Republican presidential wannabes. The PAC, American Solutions for Winning the Future, now has 17 employees, but its chief operating officer insists it's not (just) a vehicle for Gingrich's national ambitions. That said, last year $2.6 million was spent on air travel for Gingrich and his staff.