Mitt Romney and Rick Perry battle it out, the U.S. Postal Service faces bankruptcy, and Dr. Sanjay Gupta explores the terrifying effects of the World Trade Center's dust.
The media shifts its focus to Paul Ryan, John Oliver and Wyatt Cenac explore racial language in politics, and Michael Steele discusses the field of GOP candidates.
Michele Bachmann gets bumped when Rick Perry hits on America, John Hodgman rethinks bookstores, and veteran firefighter Matt Long shares his bus accident survival story.