For roughly 200 years Liverpool was a rock-solid Conservative stronghold! In fact when the Liverpool & Manchester Railway opened in 1830 the Tory Liverpool MP William Huskisson was run over by Stephenson's Rocket on the opening day and died at Eccles that evening. Manchester didn't even have an MP then, and wasn't to get one until 1832, not having had one since 1660.
Oliver Cromwell had given Manchester its first MP during his time as Lord Protector but with the death of Cromwell, the ineptitude and reluctance of his son Richard to rule and the subsequent Restoration of the Monarchy when Charles II took to the throne in 1660 republican Manchester lost its MP while Liverpool's MP Gilbert Ireland was knighted!
Considering they're the 'istree club if you ever get into a discussion with them about the history of their actual city they're not so forthcoming! Seems that like the club (didn't win the FA Cup until 1965), their left-wing history is a relatively recent thing, only dating back to the early 1970s.