With Texas Governor Rick Perry dropping out of the race and Rick Santorum declaring a belated victory in the Iowa caucuses, Thursday marked a day of big game changers in the GOP presidential contest. With one day left until the South Carolina primary, frontrunner Mitt Romney is slipping in the polls as Gingrich picks up more support, including an endorsement from Perry. As the Republican race gets tighter and attacks become even more brutal, how is President Barack Obama preparing for his campaign for 2012? Stanley Greenberg is a leading Democratic political strategist, the CEO of Greenberg Quinlan Rosner Research and the co-founder of Democracy Corps with James Carville.