Carson finished third with 20% - and other candidates finished far behind.
Here's your chance to pick the order in which the seven major candidates finish - and win prizes.
The candidate, bathed in the golden light of a summer dusk, finished his speech just as the sun set behind the hills.
Once candidates have finished their written dissertations, they must present them before a tribunal.
No candidate has ever finished less than third in Iowa and gone on to win the party's nomination.
The following candidates finished first, second and third, respectively.
In the previous election the Liberal candidate in the riding finished last.
No other candidate finished with more than 4 percent.
The other three challenging candidates all finished with strong showings in the race.
As soon as a candidate finished one bout, he had to choose his next opponent.