Hillary Clinton campaigns at Winnacunnet High School in Hampton, N.H. on Feb. 3, 2016.
Hillary Clinton campaigns at Winnacunnet High School in Hampton, N.H. on Feb. 3, 2016.James Nachtwey for TIME
Hillary Clinton campaigns at Winnacunnet High School in Hampton, N.H. on Feb. 3, 2016.
Republican presidential candidate, Marco Rubio, appeared at a GOP caucus location with his family on Feb. 1, 2016, in Clive, Iowa.
Charlee Dotson, 3, plays with a Donald Trump action figure before a campaign event for Trump in Cedar Rapids, Iowa, on Feb. 1, 2016.
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., watches caucus returns in his hotel room, on Feb. 1, 2016 in Des Moines, Iowa.
Supporters react during a caucus night party for Democratic presidential candidate, Vermont Sen. Bernie Sanders in Des Moines, Iowa on Feb. 1, 2016.
David Evers, a supporter of Democratic presidential candidate Hillary Clinton, attends her caucus night rally in Des Moines, Iowa on Feb. 1, 2016.
Republican presidential candidate Sen. Marco Rubio (R-Fla.) speaks at a campaign event in Burlington, Iowa, on Jan. 29, 2016.
Dominick Rubio, 7, joins his father Republican presidential candidate Sen. Marco Rubio (R-FL) on stage during a campaign town hall event at Mary A. Fisk Elementary School Cafeteria Feb. 4, 2016 in Salem, N.H.
Supporters wait to greet Republican presidential candidate Donald Trump during a campaign event in Council Bluffs, Iowa, on Jan. 31, 2016.
Janet Huckabee, left, attends a campaign event for her husband, Gov. Mike Huckabee at the Crossroads shooting range in Johnston, Iowa on Jan. 30, 2016.
A crowd watches from an overflow room before Republican presidential candidate Donald Trump speaks at a campaign event at the Hampshire Hills Athletic Club in Milford, N.H., on Feb. 2, 2016.
Ted Cruz greets supporters at a rally in Des Moines, Iowa on Jan. 31, 2016.
Democratic presidential candidates former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders (I-VT) appear at a Democratic debate at the University of New Hampshire on Feb. 4, 2016 in Durham, N.H.
Hillary Clinton campaigns at Winnacunnet High School in Hampton, N.H. on Feb. 3, 2016.
James Nachtwey for TIME
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The Best Political Photographs of the Week

Children can be unpredictable. So when Marco Rubio invited his seven-year-old son, Dominick, on stage during a campaign town hall event in Salem, N.H., the Republican presidential contender had to know that photographers would be pointing their cameras at him. Getty Images’ Chip Somodevilla was one of them, capturing Dominick in the middle of a large yawn as his father talked just a few feet away. Somodevilla’s image is one of the Political Photographs of the Week as selected by TIME’s photo editors.

This past week, as voting finally began in the presidential race after an 18-month-long campaign, James Nachtwey photographed Democratic frontrunner Hillary Clinton, Danny Wilcox Frazier was in Des Moines when insurgent Vermont Sen. Bernie Sanders gave his “victory” speech and Nate Gowdy documented both Democrats as they dueled one last time before New Hampshire’s upcoming primaries – all three photographers were on assignment for TIME.

On the Republican side, Natalie Keyssar, also on assignment for TIME, followed Texas Sen. Ted Cruz as he posed for selfies ahead of his Iowa win. As for Donald Trump, Damon Winter of the New York Times captured the crowds' fervor as the billionaire moved on from Iowa to New Hampshire, where he continues to lead the polls.

TIME’s selection of the Best Political Photographs of the Week is published every Thursday.

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