http://www.slate.com/articles/news_and_politics/politics/2015/05/hillary_clinton_sidney_blumenthal_and_protective_bubbles_why_the_democratic.html

Hillary Clinton spoke recently on bubbles and public life. Asked about emails sent by her longtime confidant and Clinton Foundation employee Sidney Blumenthal, the candidate said that she communicated with old friends to keep balance as Secretary of State. “I think you do have to work to make sure you’re not caught in a bubble and you only hear from a certain small group of people. And I’m going to keep talking to my old friends, whoever they are.”