Especially from the Clinton camp, there has been much talk about how Sanders isn’t really a Democrat.

While Sanders is still technically an independent in Senate, he registered as a Democrat for the New Hampshire primary.

• Is Bernie Sanders a Democrat? • 2016 Feb 23 • Linda Qiu • Politifact
• Bernie Sanders files for Democratic ballot in N.H. primary • 2015 Nov 5 • Dan Blomquist and Robert Way • Boston Globe
• Sanders declares as Democrat in NH primary • 2015 Nov 5 • Kathleen Ronayne • Burlington Free Press
• Democratic primary is far from ordinary • 2006 Sep 11 • Times Argus (regarding how the VT Democratic Party unanimously endorsed Sanders for Senate in 2006)
• How often the 2016 candidates agreed (and disagreed) in their Senate votes, charted • 2015 May 27 • Philip Bump • Washington Post