Yes, that is a feature of democratic systems. Parties want to get voted in. So they bend their programs to achieve that goal.
I live in Germany and here all parties are leaning further and further to the right, since the AfD (nationalist-conservative, some party members Neo-nazi) party is gaining in almost every poll.
If all that was at play here was mere democracy, we'd have an M4A candidate. The population is solidly to the left of either party on the majority of issues, but they get no voice because liberal democracy is an exercise in choosing between the options that capitalists have picked for you.
Your bubble/echo-chamber is solidly to the left of either party on the majority of issues.
The bulk of the population is mostly fine with or approving of a right-shift in media policy.
I don't know what you're on about wrt "media policy" but I'm not saying Americans are communists. It's been demonstrated in survey after survey that social-democratic positions are generally the most popular.