The Obama administration is readying a multimillion-dollar onslaught of ads in a dozen red states to encourage Americans to sign up for Obamacare insurance exchanges, media-tracking sources tell POLITICO. The Center for Medicare Services at the Dept. of Health and Human Services has reserved at least $12 million in airtime starting Sept. 30 in Texas, Florida, Pennsylvania, Arizona, Georgia, Missouri, Ohio, Indiana, North Carolina, Oklahoma, Tennessee, Louisiana and Michigan. All but one, Missouri, are led by Republican governors — including many who have been hostile to the health law — and even in Missouri, a Republican-dominated legislature has set an anti-Obamacare agenda.