One noticeable thing about the opinion polls leading into the last few weeks of this referendum is the remaining large number of don't knows. Without getting too technical, it appears to this observer that the swing that occurred towards the No side in the last few weeks came from straight Yes's to Nos, rather than shrinking the undecideds.
So why are there so many undecideds? I think maybe there are two answers here:
1) Possibly there are some who have secretly made up their mind but don't wish to talk about it. Maybe some poor guy in a house full of aggressive feminists who wants to vote No would prefer not to say so, and of course in some parts of the country it could work the other way too.
2) Its obvious that there is a massive media bias towards Yes and this has been played out over the months leading to the vote, if not years. But in the last few weeks we have had some debates where both sides had equal time, and its clear too that some newspapers, like The Irish Times, have felt the need to be more balanced in their coverage over the last few weeks than they normally are.
This has possibly led to a pattern that some were sure they were Yes, based on the earlier biased information they had received, and are now not so sure when they now can hear from the other side.
So that also might be swelling the undecideds. Anyway I am sure there are strong opinions on the subject on this site but in any case it might be interesting to see what information both sides are putting out to influence the undecideds. This for example is an appeal to them from the No side:
http://www.politics.ie/forum/elections/263893-manifesto-undecideds.html and if anybody knows of a comparable text from the Yes side maybe they could note it below.