21st-century American non-fiction writers in all BBC programmes
Emma Jane Kirby profiles new media mogul Arianna Huffington.
Does Barack Obama have what it takes to get to the White House?
Chris Bowlby profiles self-styled socialist US presidential hopeful Bernie Sanders.
Claire Bolderson profiles the young Indian-American governor of Louisiana, Bobby Jindal.
Ed Stourton profiles the billionaire philanthropist and investor George Soros.
Mary Ann Sieghart profiles provocative US talk show host, Glenn Beck.
Chris Bowlby looks at Jon Stewart, who has brought satire to the centre of US politics.
Allan Little profiles Republican Presidential Candidate Mitt Romney.
Samira Ahmed profiles Newt Gingrich, leading Republican contender for the US election.
Mark Coles profiles Oprah Winfrey following her speech at the Golden Globes.
Claire Bolderson profiles US Republican vice-presidential candidate Paul Ryan.
Mark Coles profiles Senator Rand Paul, a likely Republican challenger for the White House.
Mishal Husain looks at Susan Rice, a rising star in Barack Obama's inner circle.