In an interview with me earlier this week, she used her sharpest language yet to describe the “failure” that resulted from the decision to keep the U.S. on the sidelines during the first phase of the Syrian uprising.

“The failure to help build up a credible fighting force of the people who were the originators of the protests against Assad—there were Islamists, there were secularists, there was everything in the middle—the failure to do that left a big vacuum, which the jihadists have now filled,” Clinton said…

Of course, Clinton had many kind words for the “incredibly intelligent” and “thoughtful” Obama, and she expressed sympathy and understanding for the devilishly complicated challenges he faces. But she also suggested that she finds his approach to foreign policy overly cautious, and she made the case that America needs a leader who believes that the country, despite its various missteps, is an indispensable force for good. At one point, I mentioned the slogan President Obama recently coined to describe his foreign-policy doctrine: “Don’t do stupid shit” (an expression often rendered as “Don’t do stupid stuff” in less-than-private encounters).