"But you gotta get outside the bubble to really see it."
Actually, it's sufficient just to not be liberal, and to a lesser extent, be neither liberal nor conservative. (But the liberal machine is much better oiled and more generally competent, moaning about Fox News notwithstanding.) It's hard to see propaganda that you currently agree with. (I do not exclude myself from that general statement, it's just that what I find harder to see is quite different than what the general US news is currently propagating.)
But I'd also observe that even standing outside the mainstream of US political propaganda, I'm not convinced there's necessarily a cabal of insiders sitting around in their smoke filled rooms figuring out how to "keep the masses in line". I think instead you've got people figuring out how to push their agendas, often in groups, and through a process of natural selection on the agendas in question you end up with agendas that tend to satisfy people to some extent and "keep them in line". You need not "conspire" to push fairly popular ideologies on people, you need only let the adherents of those ideologies do the things they naturally will do anyhow.
Edit: Look, downvoters, you might not like to hear it, but the US propaganda machine is liberal, or at least, Democratic (if you are more liberal than the Democrats and consider them "conservative"). Look at the political affiliations of the media, Hollywood, the bureaucratic apparatus, the University and academic system, and to believe that the propaganda system isn't Democratic is to believe that all of these things are peopled by 90%+ Democrats yet somehow transcend their political orientation to push... what, exactly? It's not even close... it's not like it's 60-40, it's 90%+ plus on every survey ever taken of those groups in recent times. Note my claim here is an objectively verifiable fact, not merely an abstract partisan snipe job. Ask yourself, what else would they be pushing?
If you don't see this, well... it's probably because you're not seeing the Democratic propaganda as propaganda, leaving you seeing only what gets through that isn't.
Further edit: Would someone care to post and explain the social mechanisms whereby the media et al is populated by Democrats yet is pushing some other form of propaganda on us all the time? Evidence would suggest it will get you highly upvoted. (Personally I'd suggest the fact that people just downvote but aren't posting suggests that this is either not possible, or very hard. This probably means something.)