Well that didn't take long.
Iowa House Democrats return to Statehouse after 6-hour walkout over 2 gun-rights bills - The Washington Post (http://www.washingtonpost.com/national/iowa-house-democrats-walk-out-of-statehouse-temporarily-stalling-action-on-2-gun-rights-bills/2012/02/29/gIQAdwDuiR_story.html - broken link)
They came back after realizing they looked like a bunch of children by walking out.