The Iowa Democratic caucus race is too close to call Monday night with 96 percent of precincts reporting.

Former Secretary of State Hillary Clinton has the tiniest lead over U.S. Sen. Bernie Sanders (I-VT), garnering 49.9 percent of the delegates' support versus the senator's 49.6 percent. A coin toss has been used in at least three instances to help move the process along further when the precincts were too close to call due to an unexpected change in the number of caucus participants midway through the process, according to MSNBC and The Des Moines Register. 

The Clinton campaign declared victory Monday night, but Sanders said the two candidates are "in a virtual tie."

Meanwhile, the third candidate in the race, former Maryland Gov. Martin O'Malley, has suspended his campaign after receiving less than 1 percent of caucus-goers' support.