I haven’t received the call myself, but multiple acquaintances who are registered Iowa Democrats have been respondents for a lengthy message-testing poll about Hillary Clinton in recent days. The survey takes approximately 30 minutes and includes lots of questions about whether X, Y, or Z would be a reason you would or would not support Hillary Clinton in the next Iowa caucuses.

The survey also asks Iowans about several other possible Democratic candidates, including Vice President Joe Biden, U.S. Senators Bernie Sanders, Elizabeth Warren, and Amy Klobuchar, and former U.S. Senator Jim Webb, who recently formed an exploratory committee for a presidential bid. UPDATE: Other Iowa Democrats confirm the call asked about Maryland Governor Martin O’Malley as well.

From what I’ve heard, this poll did not ask about Republican presidential candidates, with one exception: a question about whether a Hillary Clinton/Jeb Bush match up of American political dynasties would be a good or bad thing.

I hope other Bleeding Heartland readers can provide more details about this poll, including not only questions asked but also what research firm is being used (which should be mentioned at the end of the call). My acquaintances do not recall hearing any organization’s name mentioned, such as the Ready for Hillary super PAC.  Feel free to post comments in this thread or send a confidential e-mail message.

Speaking of Clinton’s presidential prospects, Amie Parnes reported for The Hill this week that only four Republicans worry “Clinton World”: former Florida Governor Jeb Bush, U.S. Senator Rand Paul, New Jersey Governor Chris Christie, and Wisconsin Governor Scott Walker. (Parnes didn’t name all of the Clinton associates she interviewed for the story.) Of those four candidates, Walker strikes me as best-positioned to make it through the GOP primaries, if he can raise enough money for a credible campaign. Christie and Bush will be competing for the same donors and the same niche in the various primaries. I think both have taken too many positions that will be deal-breakers for the right wing.

UPDATE: In retrospect, I should not have said in the headline that someone is message-testing “for” Hillary Clinton, because a poll like this could just have easily been commissioned by a group looking for the best arguments to use against Clinton with the Iowa Democrats.