NYT: In a survey of 667 Republicans who are most likely to participate in the Iowa caucuses, Mr. Bush comes in seventh with just 5 percent saying they would probably support him. A quarter of Iowa Republicans who might caucus said they would definitely not support him.

The poll shows that 45 percent of the Iowans surveyed had an unfavorable opinion of Mr. Bush, with the same number saying he is not sufficiently conservative.

http://www.nytimes.com/politics/first-draft/2015/05/06/jeb-bush-is-failing-to-impress-iowa-republicans-poll-shows/