One substantial benefit of Television was that everyone was simultaneously watching the same thing. This increased political homogeneity by providing a shared belief system, or at least some more common ground. Such homogeneity is correlated strongly with stability and prosperity on a nation-state level.
This was particularly true from 1950 until 1970 or so, before cable television exploded (it remained true for longer in smaller nations without wide cable TV adoption). I think it matches up with a comparatively bi-partisan period in (mainstream) politics around the western world.
Of course, there are disadvantages too, but homogeneity is looking increasingly valuable as legislatures around the Western world succumb to polarisation.