"Throughout the primaries, every time I wanted to hit back against Bernie's attacks, I was told to restrain myself. Noting that his plans didn't add up, that they would inevitably mean raising taxes on middle-class families, or that they were little more than a pipe dream - all of this could be used to reinforce his argument that I wasn't a true progressive. My team kept reminding me that we didn't want to alienate Bernie's supporters. President Obama urged me to grit my teeth and lay off Bernie as much as I could. I felt like I was in a straightjacket."