WGBH News'  Adam Reilly ( @reillyadam) and  Emily Rooney( @EmilyRooneyWGBH), and Suffolk University's  David Paleologos( @davidpaleologos) explain what exactly is going on here in Massachusetts.

When it comes to political speeches and ads, Paleologos says that "local matters." Rooney agreed, calling Bernie Sanders' ads a "media barrage" that are both "personal" and "local." 

They also discussed Bill Clinton's appearances at polling sites throughout Massachusetts. Rooney called Bill Clinton a "human placard."

Watch the video above for the full caucus.