Poorer areas traditionally used to vote Democrate/Labour, if people from those poorer areas then made it, unfortunately a lot of them would then vote Republican/Conservative.

A phenomenon of the Labour party in the UK in some eyes is they were too successful and help cause their own demise, by fighting for education for all and health services for all some poorer people that then do make it then unfortunately they forget their roots and become middle class Tories, greed is a terrible thing.
Of course things have changed in recent years in the UK with more and more poor voting Conservative and some middle classes with a social conscious voting Labour.

The right wing is sweeping the board with the likes of Trump and Boris in charge, it's a sad state of affairs.