Four campaign workers who voted in New Hampshire and who listed the address of state Sen. Martha Fuller Clark as their residence did not commit voter fraud, according to the state Attorney General's Office.
"As the allegations of voter fraud are not supported, we are closing our file without further action," a letter from Assistant Attorney General Stephen G. LaBonte states.
"While working and living in New Hampshire, these individuals established a physical presence at 152 Middle Street in Portsmouth, which continued for several months," he wrote. "There is no evidence to conclude they falsely claimed New Hampshire as their domicile at the time they registered to vote."
In July, state Republican Party officials asked Attorney General Joseph Foster to investigate what they considered voter fraud related to the campaign workers who temporarily resided at the home of Martha Fuller Clark, a Democrat.
Votes were cast in the 2008 and 2012 presidential elections.
LaBonte said the four workers recently notified the Portsmouth City Clerk's Office that they would like their names removed from the voter checklist.
LaBonte also said "there was no discussion regarding registering to vote in New Hampshire between Senator Fuller Clark and any of the campaign volunteers who lived in her house."
"From the very beginning this was a petty witch-hunt and a waste of taxpayer money," Harrell Kirstein, communications director for the New Hampshire Democratic Party, said Sunday night.
"People on both sides of the aisle who have moved here and worked here and are domiciled here have voted here for years and years and years, and that's why this has never been an issue before," he said.