The key question is not whether leftist politicians have become elites (they do regularly) but whether their agenda supports elites and whether they get support from the elites, which happens very rarely. There is a lot of self-serving political decisions made by both left and right politicians from which politicians benefit, but the left politicians are nevertheless still more connected with lower classes than the right politicians.

Somewhat special example were/are communist countries where the non-political aspects of social status are reduced and the groups of communists and elites have large overlap. These countries, when compared internationally, are "left", but in the internal politics there is usually little place for using "left" and "right" as the left and right are relative characteristics which are useless when there is only one political party.