A new Quinnipiac poll of likely Iowa Republican presidential caucusgoers finds Wisconsin’s Scott Walker in front of the GOP pack with 21 percent support and a 9-point advantage over his closest primary opponents. That’s down from 25 percent and a 12-point lead in Quinnipiac’s February poll, but Walker remains ahead of his Republican rivals, with senators Rand Paul, Marco Rubio and Ted Cruz, and former Arkansas governor Mike Huckabee, all huddled together behind the Wisconsin governor. This jibes with the Real Clear Politics average of polls for the Iowa caucuses, which gives Walker a 5.5-point advantage.

Getting the biggest boost in Iowa since the February Quinnipiac poll are Rubio and Cruz, who have both declared their candidacies in the last month. Rubio was polling just 4 percent in Iowa in February to 13 percent support in May. Cruz has had a similar trajectory, from 5 percent in February to 12 percent support in May. Paul is tied with Rubio at 13 percent, but that’s the exact level of support the Kentucky senator had in February.