I don’t read too much into opinion polls. They are noisy and very often tell us little more than things haven’t changed. I do read polls of polls. UCD’s Stephan Müller maintains a good one, but there are others. These do versions of the same thing: Add up polls over a longer time frame and tell us more about structural issues.   The poll of polls shows fairly stable support for most parties since the 2020 election with one notable exception. Since October of last year, Sinn Féin is losing support, more or less directly, to Independents and others. Were they…