Ted Cruz's conventional campaign to win Iowa

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DES MOINES, IA - FEBRUARY 01: Republican presidential candidate Sen. Ted Cruz (R-TX) reaches out to supporters after winning at the caucus night gathering at the Iowa State Fairgrounds on February 1, 2016 in Des Moines, Iowa. Cruz beat out businessman Donald Trump and Sen. Marco Rubio (R-FL), who finished just behind Trump. (Photo by Christopher Furlong/Getty Images)

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Marco Rubio speaks to his supporters in Iowa

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Donald Trump thanks Iowa, congratulates opponents

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Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks at Green County Community Center, Monday, Feb. 1, 2016, in Jefferson, Iowa. (AP Photo/Chris Carlson)

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JOHNSTON, IA - JANUARY 31: Democratic Presidential Candidate Martin O'Malley speaks to potential supporters at a residence on January 31, 2016 in Johnston, Iowa. O'Malley and other candidates are making their final appeals to voters ahead of the Iowa caucus February 1. (Photo by Steve Pope/Getty Images)

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US Republican presidential candidate Donald Trump (R) is greeted on stage by fellow Republican candidate Ted Cruz before speaking at a rally organized by the Tea Party Patriots against the Iran nuclear deal in front of the Capitol in Washington, DC, on September 9, 2015.

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Republican presidential candidate Sen. Marco Rubio (R-FL) speaks to guests at a town hall syle meeting on January 29, 2016 in Dubuque, Iowa.

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Donald Trump (R) speaks as Rick Santorm (C) as Mike Huckabee (L) look on during a Trump campaign rally raising funds for US military veterans at Drake University in Des Moines, Iowa on January 28, 2016.

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Ted Cruz’s conventional campaign to win Iowa