Maine election officials tabulated results of the first-ever instant runoff for Congress on Thursday, determining that Democrat Jared Golden defeated Republican Bruce Poliquin by a narrow 50.5-49.5 margin after the second-choice preferences of voters who cast ballots for two third-party candidates were taken into account. Poliquin had led 46.4 to 45.5 on the initial balloting, but 65 percent of those who voted for independents Tiffany Bond and Will Hoar elected to mark a second choice. That group transferred their votes to Golden, who won second-choice ballots by a 69-31 margin.