The Ipsos/MRBI survey was conducted for the Irish Times and shows that the party's support is now in line with that of its presidential candidate Martin McGuinness.
Fine Gael remains the most popular political party at 35% , down 3% since July. However, this support is not transferring to its candidate Gay Mitchell, who received just 9% support for his presidential bid.
Sinn Fein are on 18%, which is almost double the support they received in February's election. Mr McGuinness received 19% support in the same poll.
Labour is down 1% to 17%, while Fianna Fail is at 16%, down 2%.
The poll surveyed 1,000 voters in all 43 constituencies on Monday and Tuesday of this week and has a margin of error of plus or minus 3%.
Source Irish Independent
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