Prompted by the mention of Derek Mahon in a thread last night I was thinking about the influence of politics on poetry (or indeed the influence of poetry on politics). With the likes Seamus Heaney in particular the impact of politics was evident, also with Mahon and even Eavan Boland (who along with Heaney I'm more familar with then Mahon) who is a voice for a strong politcal cause.
So a rounded general discussion of poetry of politics if you wish, no need to tie it down to that from an Irish perspective either as my own favourite poem in this regard isn't Irish.
It is, however, too long to replicate here so I'll provide a link. It's Locksley Hall by Alfred Lord Tennyson and can be read here.