Sanders, Clinton trade shots on Twitter

Democratic presidential hopefuls Sen. Bernie SandersBernard (Bernie) SandersOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Dems fear lasting damage from Clinton-Sanders fight MORE and Hillary ClintonHillary Diane Rodham ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain MORE battled it out on Twitter on Wednesday over the former secretary of State's progressive bona fides.

The exchange began when Sanders tweeted out a video of him speaking with reporters and one asks him if he thinks Clinton is a progressive.
"Some days, yes," the Vermont senator responds. "Except when she announces that she is a proud moderate, and then I guess she is not a progressive."
Clinton responded with a video of her own on Twitter that showed her at a rally touting her progressive achievements.
"It was kind of a low blow when Sen. Sanders said, in response to a question, 'Well maybe she's a progressive on some days,'" she said in the video.
Sanders then shot back with a chain of tweets that began with him saying, "You can be a moderate. You can be a progressive. But you cannot be a moderate and a progressive."
The exchange came hours before the two are scheduled to appear at a CNN town hall in Derry, N.H. Their campaigns have agreed to three news ones, all of which will be sanctioned by the Democratic National Committee.