FOXBORO, MA— All through the special election campaign for state Senate, supporters of Democrat Paul Feeney urged him to match the negative campaign that was being thrown against him. Outside groups sponsored fake robo calls, posted mocking ads on the Internet, and mailed out fliers of questionable accuracy. But, Feeney steadfastly refused to respond, saying he wanted to stay positive and campaign on issues such as health care. “It wasn’t a political decision for me,” Feeney said of staying positive, “it’s who I am. I put my faith in the voters.” Tuesday he was rewarded for his stance as voters elected him to the state Senate.