AP PHOTOS: The 2016 race heats up ahead of early voting

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AP PHOTOS: The 2016 race heats up ahead of early voting
Republican presidential candidate, Sen. Ted Cruz, R-Texas speaks during a campaign stop at the Freedom Country Store, Tuesday, Jan. 19, 2016, in Freedom, N.H. (AP Photo/John Minchillo)
Former Republican vice presidential candidate, and former Alaska Gov. Sarah Palin endorses Republican presidential candidate Donald Trump during a rally at the Iowa State University, Tuesday, Jan. 19, 2016, in Ames, Iowa. (AP Photo/Mary Altaffer)
Democratic presidential candidates, former Secretary of State Hillary Clinton, left, and Sen. Bernie Sanders, I-Vt. talk over each other during the Democratic presidential primary debate at the Gaillard Center, Sunday, Jan. 17, 2016, in Charleston, S.C. (AP Photo/Mic Smith)
Democratic Presidential candidate, Sen. Bernie Sanders, I-Vt. gestures as he speaks during a campaign stop, Thursday, Jan. 21, 2016, in Peterborough, N.H. (AP Photo/Matt Rourke)
Democratic presidential candidate Hillary Clinton looks at singer, songwriter and actress Demi Lovato as she speaks at a rally on the campus of University of Iowa Thursday, Jan. 21, 2016, in Iowa City, Iowa. (AP Photo/Jae C. Hong)
Republican presidential candidate Donald Trump speaks during a campaign rally, Thursday, Jan. 21, 2016, in Las Vegas. (AP Photo/Isaac Brekken)
Republican presidential candidate, New Jersey Gov. Chris Christie speaks during a campaign stop at Gilbert H. Hood Middle School, Wednesday, Jan. 20, 2016, in Concord, N.H. (AP Photo/John Minchillo)
Republican presidential candidate, businesswoman Carly Fiorina speaks with the media during a campaign stop at the Peppermill Fireside Lounge, Monday, Jan. 18, 2016, in Las Vegas. (AP Photo/John Locher)
Republican presidential candidate, Dr. Ben Carson arrives to speak to members of the media after speaking at Glenwood Community High School in Glenwood, Iowa, Thursday, Jan. 21, 2016. (AP Photo/Andrew Harnik)
Republican presidential candidate, former Florida Gov. Jeb Bush pauses as he speaks during a campaign stop at Sturm, Ruger & Co. Inc., Thursday, Jan. 21, 2016, in Newport. (AP Photo/John Minchillo)
Republican presidential candidate, Sen. Rand Paul, R-Ky, pauses while firing an AR-15 rifle at an "IRS Tax Code" sign at Crossroads Shooting Sports in Johnston, Iowa, Sunday, Jan. 17, 2016. (AP Photo/Andrew Harnik)
Republican presidential candidate Sen. Ted Cruz, R-Texas sits in a vehicle before campaign stop Wednesday, Jan. 20, 2016, in Hollis, N.H. (AP Photo/Matt Rourke)
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum waits backstage for his introduction before speaking at the Iowa Renewable Fuels Summit in Altoona, Iowa, Tuesday, Jan. 19, 2016. (AP Photo/Patrick Semansky)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., tours the Birmingham Civil Rights Institute during a campaign stop, Monday, Jan. 18, 2016, in Birmingham, Ala. (AP Photo/Brynn Anderson)
Republican presidential candidate Donald Trump takes the stage during a campaign stop, Saturday, Jan. 16, 2016, in Portsmouth, N.H. (AP Photo/Matt Rourke)
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WASHINGTON (AP) — With just over one week to go until Iowans head to the polls in the first vote of the 2016 primary season, White House hopefuls went on the offensive this week, on the campaign trail and in political ads, fighting over undecided voters in an increasingly narrowing race.

A collection of photos by Associated Press photographers following the various candidates on the campaign trail.

Just Over One Week To Iowa
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