UPDATE: 9:30 a.m. Thursday, May 24
Nate Boulton said in a statement Thursday morning he is suspending his campaign for governor.
"While I depart this campaign for governor with a heavy heart, I remain resolved to the greater cause of creating a future Iowa we all can be proud to call our home," the statement read.
There are five other Democrats running in the primary. By Thursday morning, four of them had called for Boulton to drop out of the race, and John Norris said Boulton shouldn't be the Democratic nominee.