Democratic presidential frontrunner Hillary Clinton said in an interview aired Wednesday night that special interest groups cannot buy her to gain access and influence as she continues to face scrutiny for taking large sums of money in speaking fees from the financial industry in recent years. Speaking over the phone with MSNBC’s Chris Matthews, Clinton was asked how she will respond to impending attack ads from her main primary challenger, Sen. Bernie Sanders (I, Vt.), who is expected to target her ties to Wall Street. “As anybody who knows me knows, you can’t buy me,†Clinton said in response, defending...