Mitt Romney on the campaign trail

West Des Moines, Iowa: Mitt Romney delivers a speech to supporters at the Warren residence Photograph: Michael Czerwonka/EPA

Columbus Junction, Iowa: A Romney supporter holds signs after attending a speech at the Columbus Junction community centre Photograph: Justin Sullivan/Getty

Bettendorf, Iowa: Mitt Romney gives a speech during a campaign stop at Bettendorf middle school Photograph: Michael Czerwonka/EPA

Clive, Iowa: Mitt Romney attends a house party Photograph: Eric Thayer/Getty

Altoona, Iowa: Mitt Romney and his wife, Ann, during a campaign stop Photograph: LM Otero/AP

Columbus Junction, Iowa: Romney supporters hold signs after he spoke at the Columbus Junction community centre Photograph: Justin Sullivan/Getty

Clive, Iowa: Mitt Romney with his grandson Photograph: Michael Czerwonka/EPA

Rochester, New Hampshire: Mitt Romney speaks at the American Legion hall Photograph: Robert F. Bukaty/AP

Jackson, Iowa: Mitt Romney speaks to supporters in Jackson Photograph: LM Otero/AP

Cedar Rapids, Iowa: Mitt Romney goes over campaign details with his travelling press secretary, Eric Fehrnstrom, (l) and Bob White (r) on a plane after leaving a campaign event at Cedar Rapids Photograph: Eric Thayer/Getty

Clive, Iowa: Mitt Romney casts a shadow on a photograph of Ronald Reagan while speaking at a supporter's home Photograph: LM Otero/AP

West Des Moines, Iowa: Mitt Romney attends a house party Photograph: Eric Thayer/Getty

Jackson, Iowa: Mitt Romney and his son, Craig, jog down the street to get out of the cold Photograph: LM Otero)/AP

Mt Vernon, Iowa: Mitt Romney greets patrons at the Fuel and Nest Coffee Shop Photograph: Justin Sullivan/Getty

Waterloo, Iowa: Mitt Romney at a rally Photograph: Rick Bowmer/AP

Columbus Junction, Iowa: Mitt Romney smiles before a news interview Photograph: Jeff Chiu/AP