Sanders, Clinton trade shots on Twitter

Democratic presidential hopefuls Sen. Bernie SandersBernard (Bernie) SandersHannity snaps back at 'Crybaby' Todd: 'Only conservatives have to disclose relationships?' Chuck Todd lashes out at Fox, defends wife in radio interview Trump pressed Sessions to fire FBI agents who sent anti-Trump texts: report MORE and Hillary ClintonHillary Diane Rodham ClintonPaltry wage gains, rising deficits two key tax reform concerns Trump pressed Sessions to fire FBI agents who sent anti-Trump texts: report DNC sues Russia, Trump campaign and WikiLeaks over alleged election interference 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.