ThelongestservingindependentmemberofCongressinAmericanHistory,theunassumingsenatorfromVermontisasupporterofthemiddleclasswhovowstoendthetoxicpartisandivideinCongress.Agrassroots-levelgroundswellofsupporthascatapultedSandersintothenationalspotlight,forcinghiscompetitorsto,“FeeltheBern!”