Lyric discussion by needle_too 

Cover art for Nightshift lyrics by Commodores, The

The second verse, while referring to Jackie Wilson, also refers to Jack Kennedy and his assault on racism in US Universitys - http://www.history.com/this-day-in-history/jfk-faces-down-defiant-governor - hence the 'You lifted us higher and higher' lyric. A very clever song that - like many of the greats it refers to - works on many levels.

As an aside... both Marvin Gaye and Jack Kennedy died in tragic circumstances.