After months of fierce campaigning, Iowans take the first steps in deciding which candidate will receive their respective party nomination for president of the U.S. in a historic turnout, February 1, 2016.

Ted Cruz was declared the winner on the Republican side. Mike Huckabee and Martin O'Malley suspended their campaigns. Hillary Clinton and Bernie Sanders are in a dead heat.

In this photo, workers take down a U.S. flag following a campaign stop by Democratic presidential candidate Hillary Clinton at the Family Fun Center in Adel, Iowa January 27, 2016.

Republican presidential candidate Ted Cruz kisses his wife Heidi Cruz after winning at his Iowa caucus night rally in Des Moines, February 1, 2016.

Democratic presidential candidate Bernie Sanders raises a fist as he speaks at his caucus night rally Des Moines, February 1, 2016.

Former U.S. President Bill Clinton embraces his wife, Democratic U.S. presidential candidate Hillary Clinton, as they appear with their daughter Chelsea (R) at Mrs. Clinton's caucus night rally in Des Moines, February 1, 2016.

Josh Kent celebrates at the caucus night rally for Republican presidential candidate Sen. Ted Cruz, Feb. 1, 2016, in Des Moines.

A screen shows Republican presidential candidate Ted Cruz projected the winner of the Democratic Iowa caucuses in Des Moines, February 1, 2016.

Votes are seen during the Republican caucus at the Iowa State Historical Society in Des Moines, Iowa, February 1, 2016.

Supporters of Republican presidential candidate Sen. Ted Cruz (R-TX) listen as a campaign surrogate addresses voters at a caucus site as Iowans prepare to cast their first votes in the 2016 Presidential primaries on February 1, 2016 in Des Moines.

Kim Frederick of Houston, Texas arrives for the caucus night event of Democratic presidential candidate former Secretary of State Hillary Clinton in the Olmsted Center at Drake University on February 1, 2016 in Des Moines.

Supporters cheer during Democratic presidential candidate Sen. Bernie Sanders' caucus night party February 1, 2016 in Des Moines.

Sanders and former Secretary of State Hillary Clinton were locked in a tight race with caucus goers late in the evening.

A supporter for Republican presidential candidate Sen. Marco Rubio holds a sign up at a caucus site Feb. 1, 2016 in Clive, Iowa.

People watch a television showing the Caucus return numbers at the Donald Trump for President Caucus Watch Party at the Sheraton Hotel as Ted Cruz was projected the winner February 1, 2016 in Des Moines.

Supporters watch the results as they wait for Republican presidential candidate, businessman Donald Trump at his caucus night rally, Feb. 1, 2016, in West Des Moines, Iowa.

Supporters of Republican presidential candidate Donald Trump gather for a post-caucus rally in Des Moines, February 1, 2016.

Reps. John Lewis, D-Ga., center, and Sheila Jackson-Lee, D-Texas, right, wait at Democratic presidential candidate Hillary Clinton's caucus night rally at Drake University in Des Moines, Feb. 1, 2016.

Federico Oliphant, age 8, yawns during the Democratic party caucus in precinct 317 at Valley Church on February 1, 2016 in West Des Moines.

Clinton volunteer and actor Blake Cooper Griffin from Los Angeles watches as results are displayed on a television during the caucus night event of Democratic presidential candidate former Secretary of State Hillary Clinton in the Olmsted Center at Drake University on February 1, 2016 in Des Moines.

People participate in the Democratic caucus at the Iowa State Historical Society in Des Moines, February 1, 2016.

A young fan shows her phone to Republican Presidential Candidate Donald Trump as he sits with his wife Melania, while awaiting the Iowa caucuses to begin at St Francis of Assisi church in West Des Moines, February 1, 2016.

Democratic caucus host Gary Weaver shows the math for the amount of delegates each candidate will get during the Iowa caucuses at his home in Rippey, Iowa on February 1, 2016.

Voters gather to caucus at the Republican caucus at the 7 Flags Event Center in Clive, Iowa, February 1, 2016.

Republican presidential candidate Sen. Marco Rubio, R-Fla., and his family pray during opening of a caucus site Feb. 1, 2016 in Clive, Iowa.

People gather to caucus at the Republican caucus at the 7 Flags Event Center in Clive, Iowa, February 1, 2016.

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., watches caucus returns in his hotel room, on Monday, Feb. 1, 2016, in Des Moines.

People gather for caucus at the Iowa State Historical Society in Des Moines, February 1, 2016.

A sign directs caucus goers to the home of Gary and Mary Weaver in Rippey, Iowa February 1, 2016.

A caucus worker checks in a voter prior the Republican Party Caucus at Keokuk High School on February 1, 2016 in Keokuk, Iowa.

A worker adjusts an Iowa State flag during the Republican caucus at the 7 Flags Event Center in Clive, Iowa, February 1, 2016.

Republican presidential candidate Ted Cruz carries his daughter Caroline as he arrives at a campaign event in Jefferson, Iowa, February 1, 2016.

Cruz was declared the winner of the Republican caucuses by CBS News.

Mary Jo Hartogh, secretary of the Mitchell County Republican Central Committee sets up an information board before caucuses begin at the Milton R. Owen nature in Mitchell County near Osage, Iowa, February 1, 2016.

Heather Malmberg hangs signs of support for Bernie Sanders at the home of Gary and Mary Weaver before the caucus in Rippey, Iowa February 1, 2016.

Workers for the campaign of Republican presidential candidate Jeb Bush talk on the phone in their Iowa headquarters in Des Moines, February 1, 2016.

Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks at Green County Community Center Feb. 1, 2016, in Jefferson, Iowa.

A supporter walks past a sign that marks caucus day at campaign office for Democratic presidential candidate Hillary Clinton in Ankeny, Iowa, Monday, Feb. 1, 2016, the day of the Iowa caucus.

A supporter of Republican presidential candidate Ted Cruz holds his book at a campaign event in Jefferson, Iowa, February 1, 2016.

People arrive for Republican presidential candidate Donald Trump's campaign event at the U.S. Cellular Convention Center February 1, 2016 in Cedar Rapids, Iowa.

Republican presidential candidate Donald Trump speaks to guests during a rally at the airport on January 30, 2016 in Dubuque, Iowa.

Democratic presidential candidate Bernie Sanders speaks to reporters from his bus outside his campaign's Iowa headquarters in Des Moines, February 1, 2016.

Democratic presidential candidate Hillary Clinton greets volunteers during a visit to a campaign office in Des Moines, Iowa February 1, 2016, the day of Iowa's first-in-the-nation caucus.