This is old news that Ballot Access News had previously missed. On November 4, 2014, an independent candidate was elected to the New Hampshire House of Representatives from Merrimack County district 10, which includes Hopkinton and part of Concord. The independent winner is David Luneau.
See this story about the campaign. The district elects three representatives. Luneau came in third with 2,293, and was elected along with two of the three Democratic nominees. Thanks to Darryl Perry for the information.
The December 1, 2014 Ballot Access News print issue said that fourteen independent candidates had been elected to state legislatures on November 4, 2014, but that should have said fifteen were elected.