Romney Campaign Defends Refusal To Release Tax Returns: ‘An Absolute Non-Issue’: pCHARLESTON, South Carolina — Former Massachusetts Gov. Mitt Romney (R) continues to face fire for not releasing his tax returns, particularly as questions mount about the 15 percent tax rate he says he pays, offshore investments in tax shelters like the Cayman Islands, and his continued income from the private equity firm he founded, Bain [...]/p