I don't think the Young Turks are corporate shills at all.  They don't have reporters in the field much, instead they do a great job of synthesizing what's going on.

They do the political back-and-forth, D vs. R stuff because it's entertaining.  If you don't get some laughs out of this stuff it's pretty bleak usually.  Also the reason for the cultural news part.

I would agree they don't treat enough the issue of whether the Democrats are all playing a big conspiratorial losing game.  But that's a really complicated question with a lot of different answers.