Former President Donald Trump won 98 of 99 Iowa counties in the Iowa caucuses Monday and outperformed his 2016 results. He heads into next week’s New Hampshire primary having claimed more than 50% of the vote, the biggest win in caucus history.
Crowded candidate fields often narrow rapidly following Iowa and New Hampshire, which have long been the first two contests on the presidential nominating calendar. In 2016, out of the 11 major Republican candidates who competed in Iowa, it was just over 90 days before Trump was the only one left standing. (CNN is defining major candidates as those receiving more than 1% of the vote in the Iowa caucus. By this standard, Asa Hutchinson, who suspended his campaign on Tuesday after securing only 161 votes, isn’t included in this chart.)
In 2020, the Democratic presidential field quickly narrowed in the weeks after Iowa and New Hampshire: Andrew Yang left the race after the New Hampshire primary; Tom Steyer, Pete Buttigieg and Amy Klobuchar exited in advance of Super Tuesday; and Elizabeth Warren left after a disappointing Super Tuesday.
Eventual nominee Joe Biden and Bernie Sanders remained the final two candidates until April, when Sanders dropped out. Florida Gov. Ron DeSantis and former South Carolina Gov. Nikki Haley, who finished second and third in Iowa with 21.2% and 19.7% of the vote, need strong showings to stay in the race.