I see breaking news this morning that Eoghan Murphy is resigning from the Dáil
https://www.rte.ie/news/2021/0427/1212292-politics-eoghan-murphy/
Will be quite the battle to take his seat, in what is a very diverse constituency. It has some of the most affluent neighbourhoods in Dublin, but also has sizeable traditionally working class areas like Ringsend, Irishtown & Pearse St. On top of that there's a large population of young renters in the constituency who can have a large voice if they come out to vote.
FG were the only party to run two candidates in the 3-seater, with all others opting for single candidates, and FG won the most combined first-preference votes last year, taking 27.7% but splitting it between Murphy and Kate O'Connell with only Murphy ultimately being elected for them (without meeting the quota).
Eamon Ryan topped the poll individually with 22.4% getting in on the first count.
Chris Andrews took 16.1% for SF, but only actually polled 15 votes more than Murphy (who had a running mate), and ultimately reached the quota on the 8th & final count with transfers from Labour pushing him over the line.
Jim O'Callaghan took 13.8% for FF and was elected without reaching the quota.
Labour took 7.9% and SocDems 4.5% with the remaining small parties and Indos combining for approx 7.5%
Hazel Chu likely to be the Green candidate, given she's their highest profile councillor in the constituency, and has been pushing for promotion within the party. Claire Byrne has a decent profile in the eastern end of the constituency, but unlikely to get the nod ahead of Chu.
Kate O'Connell is the first name likely to be thought of for FG, but she's had a few high profile spats with Varadkar so remains to be seen if they'll back her here, although their councillors on DCC for DBS all have a lower profile than O'Connell.
Sinn Fein's only councillor within the constituency is Daniel Ceitinn, who was co-opted to replace Chris Andrews following GE20. Andrews has been their only high profile face in the area for a number of years, so difficult to see if they'll use this as an opportunity for Ceitinn to build some profile, or draft someone else in.
Claire O'Connor is probably the highest profile FF councillor in the area, but FF in Dublin Bay South has been dominated by Jim O'Callaghan for some time now (and before that Chris Andrews prior to his jumping ship) so they'll suffer for not having a ready-made 2nd candidate in place.
Kevin Humphries will likely be the Labour candidate again, whilst long-standing repeat candidates Sarah Durcan (SDs), Annette Mooney (PBP), and Mannix Flynn (IND) are all likely to be on the ballot.
FG will likely top the poll, with Greens and SF vying for 2nd spot. Personal popularity of the Green and SF candidates will be very important in getting out the vote.
How strong FF poll will likely determine how the final picture looks (has it been a personal O'Callaghan vote, or will the FF share hold?), because ultimately the transfers from FF and Lab will determine the final position here.
I think this will end up either FG or Green - if either is in 3rd place in the penultimate count then their transfers will end up pushing the other over the line. If SF end up in 3rd place, then their transfers could be enough to push the Green candidate into 1st ahead of FG.