Heh, it would have been more precise to say 'the leaderships of both Republican and Democratic parties'.

Left & right is too imprecise, there is left/right on economic issues (worker rights, curtailing power of monopolies), and there is left/right on cultural issues (abortion, gay rights, ...).

The big coup of the rich elites has been distracting and redirecting the Democrats from economic issues to cultural ones (along the way losing the culturally conservative worker class).