Democratic presidential candidate Hillary Clinton speaks at a campaign event in Newton, Iowa, on Thursday, January 28.
Jonathan Van Norman, a field staffer for U.S. Sen. Rand Paul, loads campaign material into a van after the Republican presidential candidate attended a town-hall meeting in Knoxville, Iowa, on Friday, January 29.
A supporter of U.S. Sen. Bernie Sanders takes a smoke break before the Democratic presidential candidate held a campaign event in Des Moines, Iowa, on Tuesday, January 26.
McCoy Wicker, 5, takes pictures of U.S. Sen. Marco Rubio during a presidential campaign rally in Council Bluffs, Iowa, on Saturday, January 30.
Heidi Cruz whispers to her husband, U.S. Sen. Ted Cruz, as they are introduced at a campaign event in Ringsted, Iowa, on Friday, January 29. Cruz is seeking the Republican Party's nomination for President.
Republican presidential candidate Jeb Bush is seen through a curtain as he speaks at an event in Des Moines, Iowa, on Wednesday, January 27.
Republican presidential candidate Rick Santorum points to his target during a campaign stop at a shooting range in Boone, Iowa, on Saturday, January 30.
Ohio Gov. John Kasich, a Republican presidential candidate, has his hair cut in Manchester, New Hampshire, on Monday, January 25.
Democratic presidential candidate Martin O'Malley speaks at a town-hall event in Grinnell, Iowa, on Wednesday, January 27.
Republican presidential candidate Carly Fiorina speaks during a campaign stop in Oskaloosa, Iowa, on Wednesday, January 27.
New Jersey Gov. Chris Christie, a Republican presidential candidate, talks with a supporter before a news conference in Concord, New Hampshire, on Monday, January 25.
Former U.S. President Bill Clinton poses for a selfie during a pro golf event in La Quinta, California, on Sunday, January 24.