Barack Obama: from Iowa to New Hampshire

The Democratic presidential hopeful Barack Obama speaks at a high school campaign event in Keene, New Hampshire Photograph: Eric Thayer/Getty

Obama reaches into a crowd of around 400 people who were unable to attend a rally at the Lebanon Opera House, New Hampshire, because of a lack of space Photograph: Chip Somodevilla/Getty

Obama and his staff leave New Hampshire's Exeter high school following a meet the candidate event Photograph: CJ Gunther/EPA

Obama greets diners at a food court on January 3 - caucus day - in Des Moines, Iowa Photograph: M. Spencer Green/AP

Obama supporters cheer as he speaks at the 100 Club Dinner at the New Hampshire Dome in Nashua Photograph: M. Spencer Green/AP

Supporters wait to see Obama speak at a rally in Nashua Photograph: M. Spencer Green/AP

Obama supporters hold up letters spelling his name at a campaign rally in Derry, New Hampshire. Photograph: Michael Czerwonka/AFP

Obama climbs the stairs to the stage at a campaign rally in Portsmouth, New Hampshire Photograph: M. Spencer Green/AP

Obama prepares to begin the rally in Portsmouth, New Hampshire Photograph: CJ Gunther/EPA

Obama addresses a campaign event at Concord high school in Concord, New Hampshire Photograph: Emmanuel Dunand/AFP

Obama waves to his supporters at the Concord rally Photograph: Chip Somodevilla/Getty

Campaign badges in support of Obama at a caucus night rally at Hy-Vee Hall in Des Moines, Iowa Photograph: Michael Czerwonka/EPA

Supporters wait for Obama to address a campaign rally at the Rochester Opera House, New Hampshire Photograph: Chip Somodevilla/Getty

Supporter Brenda McClellan cheers as Obama speaks at rally in Concord, New Hampshire Photograph: M. Spencer Green/AP

Obama meets supporters at an event Nashua, New Hampshire Photograph: Michael Czerwonka/AFP

Supporters listen as Obama speaks in Davenport, Iowa Photograph: M. Spencer Green/AP

Obama talks to reporters aboard a plane on his way to a campaign stop in Sioux City, Iowa Photograph: M. Spencer Green/AP

Democratic presidential candidates at the close of the ABC/Facebook New Hampshire debates on January 5. From left are: Hillary Clinton, John Edwards and Obama Photograph: Emmanuel Dunand/AFP

Obama with his wife, Michelle, and their daughters, Sasha and Malia, during his caucus night rally at Hy-Vee Hall in Des Moines, Iowa Photograph: Saul Loeb/AFP

Obama talks to potential supporters in Mason City, Iowa, as he campagined during December Photograph: Steve Pope/EPA