Iowa Code § 52.19: Instructions.

In case any elector after entering the voting booth shall ask for further instructions concerning the manner of voting, two precinct election officials of opposite political parties shall give such instructions to the elector; but no precinct election official or other election officer or person assisting an elector shall in any manner request, suggest, or seek to persuade or induce any such elector to vote any particular ticket, or for any particular candidate, or for or against any particular amendment, question, or proposition. After receiving such instructions, the elector shall vote as in the case of an unassisted voter.