http://www.slate.com/articles/news_and_politics/politics/2015/06/hillary_clinton_s_resilient_popularity_the_democratic_frontrunner_still.html

No one, not even her strongest opponents, thinks Hillary Clinton is a weak candidate for president. The question is whether she’s especially strong, or a decent option with huge risk. In the past three months there’s been substantial evidence for the second possibility: There’s the questions about her private email use as secretary of state; the questions over her paid speeches and financial disclosures; and the questions about her husband and the Clinton Foundation, which took foreign donations during her time in the administration. No, there’s no proof of influence peddling or illegal behavior. But Clinton skeptics feel vindicated, and even Clinton allies are wary.