Possible Clues:

• Bach's 'Toccata and Fugue ___ minor'
• Like Vt. Senator Sanders
• Not bound to Hillary or Donald: Abbr
• Swing voter, for short
• Like Vermont's Sen. Sanders, pre-2015
• Like Bernie Sanders, before 2015: Abbr
• The Hoosier State (Abbr.)
• Like Sen. King and Sen. Sanders
• Politically unaffiliated (Abbr.)
• Sen. Sanders's designation until November 2015