Ireland faced political turmoil Sunday as an exit poll from the weekend’s parliamentary election suggested that Sinn Fein, a left-wing party committed to reunification of the island, finished in a virtual dead heat with the two parties that have governed since the country won independence almost a century ago. While ballot counting remained underway, the poll indicated that Prime Minister Leo Varadkar’s centrist Fine Gael party, centrist rival Fianna Fail and Sinn Fein all received about 22% of first preference votes. The survey, conducted by pollster Ipsos MRBI for national broadcaster RTE, the Irish Times, TG4 television and University College Dublin, has a margin of error of plus or minus 1.3 percentage points.