Inside the complex process that decides who wins the first big victory of the 2016 elections
donald trump
donald trump

(AP Photo/Andrew Harnik)
Donald Trump.

On Monday, more than a year of bluster and posturing will come to a head, as the first votes in the presidential-primary process are cast and the first delegates are allotted in Iowa.

Almost 20 presidential candidates have cooked pork chops with state lawmakers. They've blanketed the airwaves with advertisements. And they've made a few ideological concessions that happen to appease in-state voters.

But behind the scenes, the campaigns understand that Iowa's complex nominating process means that simply winning a voter's support before the caucus is only the first step.

That's because Iowa's caucus system, the first nominating contest in the nation, is a fairly complicated process. The state will be followed by Nevada, Alaska, Maine, and Wyoming, among others, which all hold closed caucuses within the first six weeks of voting this year.

But in the minds of many, the system is not particularly democratic.

"This event is a party run, party administered affair. No voting equipment is being used, and professional election administration officials are not managing the process," The Associated Press said in a disclaimer about its 2012 coverage.

In Iowa's case, the state allows anyone who will be at least 18 years old on Election Day to caucus in February at one of Iowa's 1,682 precincts, starting at 7 p.m local time. The vast majority will caucus with either the Democratic or Republican parties, which run quite different processes.

Democrats

Democrats have a much more complicated caucus that focuses on a concept called "viability."

Once caucus-goers have arrived, precinct chairs determine a threshold for the amount of support that a candidate — this time, former Secretary of State Hillary Clinton, Sen. Bernie Sanders (I-Vermont), or former Maryland Gov. Martin O'Malley — needs to be considered "viable." Viability is calculated based on a formula that considers how many delegates that precinct awards.

For example, viability for a caucus with two delegates is the number of attendees multiplied by 25%. Caucuses with a single delegate award the delegate based on which candidate achieves a majority support.

Attendees then divide themselves into "presidential preference groups." If a candidate doesn't meet the viability threshold, supporters can then join another group or attempt to lobby supporters from viable candidates to defect. Once the groups are solidified, the precinct awards its delegates proportionally.

hillary clinton
hillary clinton

(REUTERS/Jim Bourg)
Caucus precinct chairman Greg Nichols calls the caucus to order with a Hillary Clinton campaign megaphone in 2007.